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The Double Helix

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The mystery deepens and the action intensifies for 12-year-old Cruz Coronado and friends in the exciting third book in the Explorer Academy series. The adventure continues for Cruz, Emmett, Sailor, and Bryndis as they continue their studies at sea and travel to exotic locations around the world. A mysterious person alerts Cruz to impending danger while he and a few trusted The mystery deepens and the action intensifies for 12-year-old Cruz Coronado and friends in the exciting third book in the Explorer Academy series. The adventure continues for Cruz, Emmett, Sailor, and Bryndis as they continue their studies at sea and travel to exotic locations around the world. A mysterious person alerts Cruz to impending danger while he and a few trusted pals explore ancient ruins in Petra, Jordan, and search for another piece of the puzzle his mother left behind. Worst of all, now his father has gone missing, which prompts Aunt Marisol, his number one protector, to leave the ship in search of him. Who is the new professor who takes her place? How does the new technology he introduces help or hurt Cruz's quest? Why is Nebula determined to stop Cruz before he turns 13? The clock is ticking as his first teen birthday draws near ... a milestone that will change his life forever, one way or another.


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The mystery deepens and the action intensifies for 12-year-old Cruz Coronado and friends in the exciting third book in the Explorer Academy series. The adventure continues for Cruz, Emmett, Sailor, and Bryndis as they continue their studies at sea and travel to exotic locations around the world. A mysterious person alerts Cruz to impending danger while he and a few trusted The mystery deepens and the action intensifies for 12-year-old Cruz Coronado and friends in the exciting third book in the Explorer Academy series. The adventure continues for Cruz, Emmett, Sailor, and Bryndis as they continue their studies at sea and travel to exotic locations around the world. A mysterious person alerts Cruz to impending danger while he and a few trusted pals explore ancient ruins in Petra, Jordan, and search for another piece of the puzzle his mother left behind. Worst of all, now his father has gone missing, which prompts Aunt Marisol, his number one protector, to leave the ship in search of him. Who is the new professor who takes her place? How does the new technology he introduces help or hurt Cruz's quest? Why is Nebula determined to stop Cruz before he turns 13? The clock is ticking as his first teen birthday draws near ... a milestone that will change his life forever, one way or another.

30 review for The Double Helix

  1. 5 out of 5

    Kailey (BooksforMKs)

    Cruz and his friends on board the Orion are heading to the Mediterranean, searching for clues left behind by Cruz's mother before she died. The evil Nebula operatives are never far behind, spying on Cruz and threatening his family. In the middle of his secret quest for his mother's clues, Cruz still has to attend Explorer Academy classes, compete with his team in class competitions, and try to have a little fun at a student Halloween party. His thirteenth birthday is quickly approaching, and Cru Cruz and his friends on board the Orion are heading to the Mediterranean, searching for clues left behind by Cruz's mother before she died. The evil Nebula operatives are never far behind, spying on Cruz and threatening his family. In the middle of his secret quest for his mother's clues, Cruz still has to attend Explorer Academy classes, compete with his team in class competitions, and try to have a little fun at a student Halloween party. His thirteenth birthday is quickly approaching, and Cruz is in more danger than ever as he navigates the intricacies of the toughest adventure yet! I loved this plot! There is plenty of action and suspense. I never knew what was going to happen next! There are several plot-lines intersecting as Cruz juggles his school responsibilities, his personal relationships, dodging the nefarious Nebula, and keeping contact with Lani, his best friend back home in Hawaii. The exotic locations are amazing, and I loved learning the history about different cultures, monuments, artifacts, and landmarks in Spain, Egypt, Turkey, and Jordan. It's so interesting to see the true history and real facts about actual places interwoven with the story. The fictional technology is really cool, introducing fancy gadgets that can scan objects and give a readout of the objects' material, properties, age, and characteristics. Of course, Mell, the honeybee robot drone, is always by Cruz's side, ready to protect her master. I just love that cute little bee! I loved Cruz's character development in this book. He has been betrayed twice by people close to him, and he's wary and suspicious, unwilling to trust anyone with his secrets. He even pulls away from his best friends a little, but eventually he begins to realize that there ARE people he can trust, who care about him, and will do anything for him. He feels so alone at the beginning of the book, holding it all close inside himself, but by the end he begins to reach out again to his family, sharing with them and relying on them, instead of trying to do it all by himself. Just brilliant character development! I really enjoyed the writing style, which has both some serious situations and some humor to keep things light. The writing sparked my attention and kept me turning those pages way past my bedtime! I was impressed by how subtle the writing can be at times, using something simple but powerful to deliver an emotional punch at a critical point in the story. For instance, Cruz has been handling everything on his plate so well, keeping his cool and thinking analytically through every challenge, but when Cruz thinks the little dog, Hubbard, is sick, suddenly Cruz loses his handle on his emotions and begins to collapse. It shows in a simple and subtle way how much the pressure is really getting to Cruz even though he doesn't let it show. All of a sudden, this one little thing becomes the last straw, and he just can't handle the situation anymore. It effectively shows the heart of the character and the mindset that he's in, despite the brave front he shows to the other characters. Brilliant writing and extremely touching! The artwork is a cool mixture of illustrations overlaid on top of real photographs, and it adds a wonderful dimension and depth to the story. I loved seeing the characters brought to life in the artwork, as well as the beautiful locations they visit. It really makes a special addition to the story! This book ends on a cliffhanger, and I am dying for the next book!!!! Disclaimer: I received a copy of this book from the publisher in exchange for a free and honest review. All the opinions stated here are my own true thoughts and are not influenced by anyone.

  2. 4 out of 5

    Quang

    Cao trào ít hơn hẳn hai tập trước, cách xử lý cũng ko tốt bằng. Các công nghệ khám phá cũng không có được sự đặc sắc vốn là đặc trưng của bộ truyện này Tập này ko mang lại cho mình cảm giác hào hứng như hai tập trước nhưng cái kết chuyển giao tập sau khá hứa hẹn đấy. Điểm sáng duy nhất là cuộc đua ở mê cung. Khi Cruz phải teamwork chung với thằng nó ko ưa là Dugan. Khi gạt bỏ được cái ích kỷ bé nhỏ cá nhân đề hướng tới lợi ích chung của nhóm thì kết quả đạt được sẽ không chỉ dừng ở thành tích ca Cao trào ít hơn hẳn hai tập trước, cách xử lý cũng ko tốt bằng. Các công nghệ khám phá cũng không có được sự đặc sắc vốn là đặc trưng của bộ truyện này Tập này ko mang lại cho mình cảm giác hào hứng như hai tập trước nhưng cái kết chuyển giao tập sau khá hứa hẹn đấy. Điểm sáng duy nhất là cuộc đua ở mê cung. Khi Cruz phải teamwork chung với thằng nó ko ưa là Dugan. Khi gạt bỏ được cái ích kỷ bé nhỏ cá nhân đề hướng tới lợi ích chung của nhóm thì kết quả đạt được sẽ không chỉ dừng ở thành tích cao, mà quan trọng hơn là sự thấu hiểu và giảm đi những ác cảm không cần thiết.

  3. 4 out of 5

    Matthew

    Loved this book! Pictures were awesome! Recommend to anyone who likes thrilling adventures. Very, very tense!

  4. 4 out of 5

    Aeicha

    Cruz Coronado’s thirteenth birthday is fast approaching and he’s still on the hunt for the puzzle pieces his mother hid and left for him before she died. But the nefarious Nebula is also still after the puzzle pieces, and determined to destroy Cruz. Aunt Marisol has left the Orion (the Explorer Academy ship Cruz is studying on) to search for his missing father, and Cruz must stay behind and continue his search and his studies. And his search leads Cruz, Emmett, and Sailor to the ruins in Petra, Cruz Coronado’s thirteenth birthday is fast approaching and he’s still on the hunt for the puzzle pieces his mother hid and left for him before she died. But the nefarious Nebula is also still after the puzzle pieces, and determined to destroy Cruz. Aunt Marisol has left the Orion (the Explorer Academy ship Cruz is studying on) to search for his missing father, and Cruz must stay behind and continue his search and his studies. And his search leads Cruz, Emmett, and Sailor to the ruins in Petra, Jordan. What will they find there? Will it take Cruz closer to uncovering the mystery behind Nebula and his mother’s death? Will he make it to his thirteenth birthday? Trudi Trueit’s spectacular and cinematic middle-grade Explorer Academy series, continues with the thrilling and engaging third book, The Double Helix! Once again, Trueit offers young readers a thrillingly fast-paced, expertly researched, utterly engrossing story that is simply unputdownable! Like books one and two in this series, The Double Helix takes readers on a breathtaking journey to faraway places, introduces the coolest tech; gadgets; science; and concepts, and encourages readers to use their creativity, think critically, and explore the world around them. Mystery, action, clever puzzles, captivating educational moments, relatable characters, and the cinematic illustrations all collide, taking readers on an unforgettable thrill ride and reading experience. Cruz, Emmett, Sailor, Lani, and Bryndis continue to be a wonderfully diverse, capable, and likable group of young characters. Young readers will love getting to know these beloved characters even better in book three, while learning more interesting information about the baddies, as well as meeting some intriguing new characters. There is so much about this series that I love- the clever mystery, the exciting adventure, the smart STEM elements, the awesome young characters- and The Double Helix is another compelling addition to this phenomenal series!

  5. 4 out of 5

    Amanda

    Well, that ended too quickly. And now I have to wait. Bummer. (Checking date to see when the next one comes out...double bummer!) I love this group of friends and not exactly friends. These kids are a wonderful read, and I will continue to recommend these books! I have my suspicions about someone in the group which rather makes me sad (what is it with the animal nicknames...haha). Ever since seeing "Indiana Jones and the Holy Grail" I have been excited about Petra. Reading about the hordes of tou Well, that ended too quickly. And now I have to wait. Bummer. (Checking date to see when the next one comes out...double bummer!) I love this group of friends and not exactly friends. These kids are a wonderful read, and I will continue to recommend these books! I have my suspicions about someone in the group which rather makes me sad (what is it with the animal nicknames...haha). Ever since seeing "Indiana Jones and the Holy Grail" I have been excited about Petra. Reading about the hordes of tourists there was a reality slap. Oh, right. I guess everyone wants to see it just like me! Well, there goes that fantasy of wandering all alone through dusty streets and making a brilliant discovery. (Laughing at myself here). Every book in this series has taken us someplace new and not exactly on every child's radar. Or at least I wouldn't guess that most middle-schoolers would know all about the Seed Vault or Petra. Maybe I am wrong? Looking forward to the next book, and hopefully better choices made on the MCs parts? (view spoiler)[Okay, if his Dad could now be kept safe so that he cannot be used as a liability, and now that we have 3 pieces, and now that we KNOW that there is a secret-ish group looking out for him, c'mon! Let's get one of the Bad Guys! Yeah! Let's turn the tides for one book and make readers at least think things are working for good, and then BAM! show that no, it was all an evil plot and spoil everything! Mwahahaha...until the end when everything works out the way it should. Happy Ending. Because there Must Be a Happy Ending. Yea Verily. (hide spoiler)]

  6. 5 out of 5

    V

    Why I chose this book: Because I could hardly wait to read it after The Nebula Secret and The Falcon's Feather. A review copy was provided in exchange for an honest review. Mom's Review As I sit down to write this, my husband says across the cafe table, "You can write that your husband is sick of hearing how much you liked this book." Apparently, I've been raving to him about it for the past several days without even realizing it. I knew I had a book hangover and that I wish Book 4 were already ava Why I chose this book: Because I could hardly wait to read it after The Nebula Secret and The Falcon's Feather. A review copy was provided in exchange for an honest review. Mom's Review As I sit down to write this, my husband says across the cafe table, "You can write that your husband is sick of hearing how much you liked this book." Apparently, I've been raving to him about it for the past several days without even realizing it. I knew I had a book hangover and that I wish Book 4 were already available, but apparently I'm worse off than I thought. I haven't gotten this wrapped up in a series of middle-grade books since The Giver and Ranger's Apprentice when I was teaching 6th grade. The Double Helix is like if National Geographic produced a young people's version of James Bond/Mission Impossible/Indiana Jones. There are amazing gadgets, puzzles to solve, tomb robbers to thwart, artifacts to uncover, and kidnappers to catch. And Cruz, Sailor, Emmett, and Lani navigate all this at age 12 while in school. If you haven't read the first two books, then The Double Helix wouldn't make sense. The characters are on the hunt for the third cipher — in Petra! Nebula (the evil big Pharma corporation) continues to threaten Cruz's life while also trying to get the cipher from him. The ending is both satisfying and a cliffhanger. Book 4 can't come fast enough. Explorer Academy is a series that I recommend for middle grade readers (literally, when I am asked for gift recommendations, I suggest these books). It's thrilling and inspiring. I wouldn't be surprised if we have a bunch of aspiring archeologists, conservationists, and inventors out of the Explorer Academy readers.

  7. 5 out of 5

    Kristi Bernard

    Cruz and his friends are still at the Academy, but something has happened. Cruz’s dad is missing and his aunt Marisol wants Cruz to stay with Dr. Luben and continue searching for the missing pieces of the puzzle his mom left for him while she searches for his dad. As always, these plans changed a bit, when Cruz received a mysterious email from Nebula who let him know they have his father and will contact him at the explorer Halloween party. Nebula wants the cipher pieces. The search was on to fi Cruz and his friends are still at the Academy, but something has happened. Cruz’s dad is missing and his aunt Marisol wants Cruz to stay with Dr. Luben and continue searching for the missing pieces of the puzzle his mom left for him while she searches for his dad. As always, these plans changed a bit, when Cruz received a mysterious email from Nebula who let him know they have his father and will contact him at the explorer Halloween party. Nebula wants the cipher pieces. The search was on to find his dad, find missing pieces and enlist the help of his friends to stop Nebula. This is another exciting, action packed mystery with plenty of cool puzzles for your readers to solve. Readers will also learn about cool technology and history. Parents and teachers will enjoy sharing this read that’s perfect for the curious kid looking for an adventure.

  8. 4 out of 5

    VBergen

    I liked this book more than the first two. This one is fast paced adventures, while the other books sometimes give too many details about his doubts and feelings, and less action. I look forward for the next book, however two things were a little disappointing. - When Cruz read the marmalade message, knowing that there's someone from Nebula in the ship, the first thought would have been taking the plate with the message to use the PANDA with it to try to see if there is some human human DNA to gi I liked this book more than the first two. This one is fast paced adventures, while the other books sometimes give too many details about his doubts and feelings, and less action. I look forward for the next book, however two things were a little disappointing. - When Cruz read the marmalade message, knowing that there's someone from Nebula in the ship, the first thought would have been taking the plate with the message to use the PANDA with it to try to see if there is some human human DNA to give him clues about who is the spy. - I read and re-read to see if I missed a page, but I think he didn't check the DNA results on his tablet and instead went to see the stars and then the adventure in Turkey without checking the results. Odd.

  9. 5 out of 5

    Caprice Hokstad

    I forgot to enter when I read the first two books. I really enjoy this series. I'm guessing it's supposed to be a middle grade by the age of the protagonists. The whole premise requires quite a bit of suspension of disbelief, but most science fiction does, so I can deal with that. Sci fi and adventure and lots of pre-teen wish fulfillment. At least it's intelligent and not bogged down with sexual tension or other cliche tropes. Why aren't there many good books like this for ADULTS? Kids get all I forgot to enter when I read the first two books. I really enjoy this series. I'm guessing it's supposed to be a middle grade by the age of the protagonists. The whole premise requires quite a bit of suspension of disbelief, but most science fiction does, so I can deal with that. Sci fi and adventure and lots of pre-teen wish fulfillment. At least it's intelligent and not bogged down with sexual tension or other cliche tropes. Why aren't there many good books like this for ADULTS? Kids get all the fun.

  10. 5 out of 5

    Sarah

    This one was a little more suspenseful than I liked and it didn’t have as much exploration as the first two, but it was still an amazing story. I hope the next one has even more exploration, discoveries, and exciting adventures.

  11. 5 out of 5

    Two BookWorms Blog

    I love the way that science is blended right in with the story. The Truth Behind the Fiction portion of each novel is my personal favorite part. For the full review: https://twobookwormsblog.wordpress.co... I love the way that science is blended right in with the story. The Truth Behind the Fiction portion of each novel is my personal favorite part. For the full review: https://twobookwormsblog.wordpress.co...

  12. 4 out of 5

    Allison

    Double Helix, the third book in the Explorer Academy by @truditrueit, is as action packed as the first two. Cruz and hiS friends continue to follow the trail of clues his late mother left for him, but now Nebula has upped their attacks in both Cruz and those he loves. I love the way hard science is integrated into the story line.

  13. 4 out of 5

    Kaelyn

    What a great third book to this series!! But why oh why did it have to leave off on a cliffhanger?!! i love cliffhangers but after awhile your fingers grow numb. lol

  14. 4 out of 5

    Valerie

    Good thanks my book 4 comes out next month. Student will love it, but what a cliffhanger!

  15. 5 out of 5

    Sara

    Cliffhanger ending!!! 4.5/5

  16. 4 out of 5

    Lisa Bittle

    A real cliff hanger...keeps reader interested.

  17. 5 out of 5

    Taurean Branch

    Very quick book to get through. I am loving this story line. I can’t wait to read the next book. It’s a very simple and easy to read book. No complex language, very educational.

  18. 4 out of 5

    Andréa

    Note: I received an ARC of this book from the publisher at ALA Annual 2019.

  19. 5 out of 5

    Xydel

    This has a lot of suspense and catches your interest right from the beginning. I absolutely love this series!!! Read this one in a day - it's that good!

  20. 5 out of 5

    Sophia Shattls

  21. 4 out of 5

    Abigail Velazquez

  22. 4 out of 5

    Rick

  23. 4 out of 5

    Becky

  24. 5 out of 5

    J. Tracey

  25. 4 out of 5

    Annette Wagoner

  26. 5 out of 5

    Lab

  27. 5 out of 5

    Daniel

  28. 5 out of 5

    Nikki Valdez

  29. 5 out of 5

    RagDoll

  30. 5 out of 5

    Jodie

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