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.

Twins Hopper and Eni discover their strange new school is built on coding puzzles and a dangerous secret.

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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

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

Similar stories for the same ages, none more intense than this one should be for its youngest readers.

Ages 9–14
Spy School
by Stuart Gibbs
Ben Ripley enters a secret CIA academy, where training, friendships, and real enemy attacks reveal the dangerous world of espionage.
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Ages 9–11
George's Secret Key to the Universe
by Lucy & Stephen Hawking
George travels through cosmic portals with scientist Eric, exploring space while protecting a powerful supercomputer from danger.
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Ages 9–11
Escape from Mr. Lemoncello's Library
by Chris Grabenstein
Children trapped overnight in an extraordinary library must solve elaborate puzzles created by famous game-maker Luigi Lemoncello.
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Ages 9–14
The Explorer
by Katherine Rundell
Four children survive a plane crash in the Amazon and search for a way home with help from a mysterious explorer.
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Ages 9–11
Gangsta Granny
by David Walliams
Ben expects another boring visit with Granny, then discovers her secret past and joins an outrageous jewel-heist adventure.
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Ages 9–11
Frindle
by Andrew Clements
Nick invents the word “frindle,” sparking a classroom battle that grows into a national language phenomenon.
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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.

Age rating and parents' guideSecret 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.

Twins Hopper and Eni discover their strange new school is built on coding puzzles and a dangerous secret.

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

Similar stories for the same ages, none more intense than this one should be for its youngest readers.

Ages 9–14

Spy School

by Stuart Gibbs

Ben Ripley enters a secret CIA academy, where training, friendships, and real enemy attacks reveal the dangerous world of espionage.

Know more Get book

Ages 9–11

George's Secret Key to the Universe

by Lucy & Stephen Hawking

George travels through cosmic portals with scientist Eric, exploring space while protecting a powerful supercomputer from danger.

Know more Get book

Ages 9–11

Escape from Mr. Lemoncello's Library

by Chris Grabenstein

Children trapped overnight in an extraordinary library must solve elaborate puzzles created by famous game-maker Luigi Lemoncello.

Know more Get book

Ages 9–14

The Explorer

by Katherine Rundell

Four children survive a plane crash in the Amazon and search for a way home with help from a mysterious explorer.

Know more Get book

Ages 9–11

Gangsta Granny

by David Walliams

Ben expects another boring visit with Granny, then discovers her secret past and joins an outrageous jewel-heist adventure.

Know more Get book

Ages 9–11

Frindle

by Andrew Clements

Nick invents the word “frindle,” sparking a classroom battle that grows into a national language phenomenon.

Know more Get book

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.