The Great Brain
John Dennis Fitzgerald
The Great Brain
Age Rating, Reading Level & Content Guide
by John Dennis Fitzgerald
Illustrated by Mercer Mayer
The text is written at a 4th 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
Nobody outsmarts the Great Brain—because he’s the smartest ten-year-old con man in the whole Midwest! When the Jenkins boys disappear in Skeleton Cave, it’s up to him to save the day, proving brains always beat brawn. But outsmarting everyone isn’t just fun—it’s how he makes his mark.
Quick Assessment
This humorous historical fiction follows Tom, a clever and entrepreneurial ten-year-old, as he navigates adventures and mischief in a small town. Suitable for ages 9-12, the story blends action and humor with themes of friendship and problem-solving. Parents should note mild instances of trickery and conning used in a lighthearted context.
Why we rated The Great Brain 9LP
The Great Brain is written at a Level 4-5 reading level across 175 pages. Strong independent readers around grade 5.5 can typically handle this book on their own; with parent or teacher support, The Great Brain works for readers up to grade 6.5.
We rate The Great Brain as 9LP ("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.
No specific content flags were raised by community reviewers, which is consistent with the mild intensity score.
Thematically, The Great Brain explores humor, adventure, historical, friendship, 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.
- ✓ Kids drawn to stories about humor, adventure, historical.
Maybe not for
- ! Readers looking for something heavier — this is a gentle, low-stakes story by design.
For Parents
Content Intensity
9LP — Light — PhysicalLight conflict or tension. Mild peril resolved quickly.
Was our "Mild" content intensity rating accurate for this book?
Reading Insights
Hook Factor
3/10A steady, thoughtful read that rewards patient readers.
Discussion Potential
3/10A lighter read — great for independent enjoyment.
Book DNA
Multi-dimensional content fingerprint
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Details
Book Length
- ISBN
- 9780142400586
- Pages
- 175
- Publisher
- Penguin
- Published
- 2004
- Type
- Fiction