Age rating and parents' guide:George's Secret Key to the Universe

by Lucy & Stephen Hawking

Ages 9–11

George's Secret Key to the Universe by Lucy & Stephen Hawking is best for children aged 9–11. It has no violence, a few mildly scary moments, no romance and no bad language.

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

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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

Novel
Part of the George series
A steady start that picks up quickly
Mostly text
Emotionally light

Great for kids who like

Science Fiction & Space
Mystery & Detective
Action & Adventure

Reading mood

Adventurous
Mysterious
Suspenseful

Good to talk about

Science
Science Fiction & Space

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The Explorer
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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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From the Mixed-Up Files of Mrs. Basil E. Frankweiler
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Claudia and her brother run away to the Metropolitan Museum, where they investigate the mystery of an angel statue.
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Questions parents ask

Q: What age is George's Secret Key to the Universe for?

George's Secret Key to the Universe suits children aged 9–11. It is a novel: a steady start that picks up quickly, mostly text.

Q: Is George's Secret Key to the Universe 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 George's Secret Key to the Universe part of a series?

Yes, it belongs to the George series. If your child enjoys it, the other George books are the easiest next step.

Q: What should my child read after George's Secret Key to the Universe?

Try Spy School, The Explorer and From the Mixed-Up Files of Mrs. Basil E. Frankweiler. They share the same kind of story and suit the same ages.

Age rating and parents' guideGeorge's Secret Key to the Universe

by Lucy & Stephen Hawking

Ages 9–11

George's Secret Key to the Universe by Lucy & Stephen Hawking is best for children aged 9–11. It has no violence, a few mildly scary moments, no romance and no bad language.

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

Books like George's Secret Key to the Universe

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 9–14

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

From the Mixed-Up Files of Mrs. Basil E. Frankweiler

by E.L. Konigsburg

Claudia and her brother run away to the Metropolitan Museum, where they investigate the mystery of an angel statue.

Know more Get book

Ages 9–11

The Serpent's Secret

by Sayantani DasGupta

Kiran discovers she is an Indian princess and enters a magical realm to rescue her parents from a demon king.

Know more Get book

Ages 9–11

Secret Coders

by Gene Luen Yang

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

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

Questions parents ask

Q: What age is George's Secret Key to the Universe for?

George's Secret Key to the Universe suits children aged 9–11. It is a novel: a steady start that picks up quickly, mostly text.

Q: Is George's Secret Key to the Universe 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 George's Secret Key to the Universe part of a series?

Yes, it belongs to the George series. If your child enjoys it, the other George books are the easiest next step.

Q: What should my child read after George's Secret Key to the Universe?

Try Spy School, The Explorer and From the Mixed-Up Files of Mrs. Basil E. Frankweiler. They share the same kind of story and suit the same ages.