What reading level is Spy school?

Spy school by Stuart Gibbs is at a Level 5-6 reading level (Lexile 740L). Recommended for Middle Grades readers (Ages 9-12).

What age is Spy school appropriate for?

Spy school is recommended for Ages 9-12. HootRating: 10LP (Light — Physical). Content flags: Mild Peril.

What genre is Spy school?

Spy school is fiction. Part of the Spy School series.

Does Spy school have any content warnings?

Spy school has a HootRating of 10LP (Light — Physical). Content flags include: Mild Peril. On HootRated, every book is rated across four dimensions — emotional, physical, social, and thematic — to help parents make informed choices.

How many pages is Spy school?

Spy school by Stuart Gibbs is 290 pages.

Reviewed by HootRated editorial · Last updated May 18, 2026

Spy school

Stuart Gibbs

Spy school

Age Rating, Reading Level & Content Guide

by Stuart Gibbs

Spy School · Book 1

Reading Level 5-6 10LP Ages 9-12 Balanced Read

The text is written at a 5th grade reading level, the subject matter is intended for middle graders (ages 9–12), and the content is mild with minimal sensitive material.

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About This Book

Dive into a thrilling world where school is a secret training ground for young spies! Follow a clever and courageous student as they navigate classes filled with hidden missions, unexpected challenges, and daring adventures. Perfect for readers who love mystery and action packed into everyday school life.

Themes

SchoolsAdventure Mystery Coming of Age

Quick Assessment

This is a Level 5-6 book with mild content intensity. Content themes include mild peril. Written for readers ages 9-12.

Why we rated Spy school 10LP

Spy school is written at a Level 5-6 reading level with a Lexile measure of 740L across 290 pages. Strong independent readers around grade 6.5 can typically handle this book on their own; with parent or teacher support, Spy school works for readers up to grade 7.5.

We rate Spy school as 10LP ("Light — Physical") because the content sits in the "Mild" range — mild conflict — the kind a child encounters in normal play and sibling life. Across our four dimensions (emotional, physical, social, thematic) the book reads as evenly mild; no single dimension stands out as a concern.

Specific content flags noted by reviewers: Mild Peril.

Thematically, Spy school explores schools, adventure, mystery, and coming of age — these threads give the book room to mean different things to different readers.

Good fit for

✓ Children in the Ages 9-12 range — the maturity and attention span match the story's pacing.
✓ Readers who like a steady plot with enough momentum to keep pages turning.
✓ Kids drawn to stories about schools, adventure, mystery.
✓ Readers who fall hard for one book and want a long series to live in — there are 9 more books in the Spy School series.