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Cover of Secret Coders

Age rating and parents' guide:Secret Coders

by Gene Luen Yang

Ages 9–11

Secret Coders by Gene Luen Yang is best for children aged 9–11. It has no violence, a few mildly scary moments, no romance and no bad language.

Hopper enters Stately Academy, an odd school filled with creepy four-eyed birds and mysterious secrets. Teaming up with fellow student Eni, she uncovers puzzles left behind by the school's eccentric founder. By learning real-world computer science concepts, binary code, and logic, the pair begin hacking their way through the school's bizarre mysteries. It is an engaging graphic novel that seamlessly blends an intriguing detective story with playful STEM learning.

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Content ratings

How much of each a parent can expect, from none to strong.

Violence
None
Scary moments
Mild
Romance
None
Bad language
None
Dhiraj Bodade

Content checked by Dhiraj Bodade, co-founder of Bookstaken, on 21 September 2026.

At a glance

  • ★Graphic novel
  • ★Part of the Secret Coders series
  • ★Easy to get into from the first page
  • ★Pictures on almost every page
  • ★Emotionally light
  • ★A good pick for reluctant readers

Great for kids who like

  • Mystery & Detective
  • Action & Adventure
  • Realistic Fiction (School & Friendships)

Reading mood

  • Adventurous
  • Mysterious
  • Suspenseful

Good to talk about

  • Science
  • Robots & inventions

Books like Secret Coders

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  • Cover of George's Secret Key to the Universe

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    George's Secret Key to the Universe

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    George's pet pig escapes into the next-door garden, leading him to meet his eccentric neighbor Eric and Eric's daughter Annie. Eric owns Cosmos, an incredible supercomputer capable of opening doorways into outer space. When a sinister teacher schemes to steal Cosmos, George finds himself on an extraordinary journey through the cosmos to save the day. Blending an exciting science-fiction adventure with real astrophysics explained clearly, it is an engaging ride for curious young readers fascinated by the stars.

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  • Cover of Escape from Mr. Lemoncello's Library

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    Escape from Mr. Lemoncello's Library

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  • Cover of The Explorer

    Ages 9–14

    The Explorer

    by Katherine Rundell

    When a small plane crashes into the Amazon rainforest, four children survive alone with no adults to guide them. Fred, Con, Lila, and young Max must quickly figure out how to forage, build shelter, and navigate the jungle's dangers together. Their desperate fight for survival takes a surprising turn when they uncover clues left by a mysterious figure who lives hidden deep within the trees. It is a gripping, atmospheric adventure that celebrates resilience, teamwork, and the natural world.

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  • Cover of Gangsta Granny

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    Ben dreads staying with his cabbage-obsessed grandmother every Friday evening, convinced she is the most boring person alive. Everything changes when he stumbles upon a tin full of diamonds and discovers she is actually an international jewel thief with eyes on the Crown Jewels. Teaming up for an audacious heist brings the pair close together. Packed with silly humour, cheeky jokes, and real warmth, this story delivers fast-paced laughs alongside a genuinely touching look at the special bond between grandparents and grandchildren.

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  • Cover of Frindle

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    Frindle

    by Andrew Clements

    Fifth-grader Nick Allen is known for his clever ideas and knack for distracting teachers. When he decides to coin a new word for pen—"frindle"—his strict language arts teacher, Mrs. Granger, is not amused. What starts as a simple classroom prank quickly spirals out of control, spreading across the school and sparking a national craze. This smart, funny school story explores how language evolves, creative thinking, and the surprising respect that can grow between a mischievous student and a dedicated teacher.

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Questions parents ask

Q: What age is Secret Coders for?
Secret Coders suits children aged 9–11. It is a graphic novel: easy to get into from the first page, pictures on almost every page.
Q: Is Secret Coders appropriate for a 9 year old?
Yes. Bookstaken rates it for ages 9–11. It has no violence, a few mildly scary moments, no romance and no bad language.
Q: Is Secret Coders part of a series?
Yes, it belongs to the Secret Coders series. If your child enjoys it, the other Secret Coders books are the easiest next step.
Q: What should my child read after Secret Coders?
Try Spy School, George's Secret Key to the Universe and Escape from Mr. Lemoncello's Library. They share the same kind of story and suit the same ages.
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