The 39 Clues
Riley Clifford
The 39 Clues
Age Rating, Reading Level & Content Guide
Rapid Fire
by Riley Clifford
The text is written at a 6th grade reading level, the subject matter is intended for middle graders (ages 9–12), and the content is mild with minimal sensitive material.
We may earn a commission from these links. Bookshop.org supports independent bookstores with every purchase.
About This Book
Flames lick the night sky as Washington burns—can you escape the chaos with a young Cahill? Magic sparkles as Houdini reveals a secret trick that might save his life, but what if it’s not enough? Deep beneath the ocean, a daring mission on the world’s first nuclear submarine puts everything on the line. What hidden dangers lie ahead?
Quick Assessment
This middle-grade adventure book features three thrilling stories centered around the powerful Cahill family, intertwined with significant historical events. Suitable for ages 9-12, the stories include mild peril and suspense but no graphic content. The book encourages curiosity about history through action-packed fictional tales.
Why we rated The 39 Clues 11LP
The 39 Clues is written at a Level 6 reading level across 257 pages. Strong independent readers around grade 7.0 can typically handle this book on their own; with parent or teacher support, The 39 Clues works for readers up to grade 8.0.
We rate The 39 Clues as 11LP ("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, The 39 Clues explores adventure, historical, family, and mystery — 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 adventure, historical, family.
Maybe not for
- ! Readers looking for something heavier — this is a gentle, low-stakes story by design.
For Parents
Content Intensity
11LP — Light — PhysicalLight conflict or tension. Mild peril resolved quickly.
Content Flags
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
Similar Books
Based on content and theme analysis
Get a Clue!.
Quinlan B. Lee
Get a Clue!.
Quinlan B. Lee
Secret of the Forbidden City
James Patterson, Chris Grabenstein
Secret of the Forbidden City
James Patterson, Chris Grabenstein
The 39 Clues
Peter Lerangis
The 39 Clues
Peter Lerangis
The 39 Clues / The Sword Thief (3)
Peter Lerangis
The 39 Clues / The Sword Thief (3)
Peter Lerangis
(The 39 Clues: Cahills vs. Vespers, Book 5) - Library Edition
Linda Sue Park
(The 39 Clues: Cahills vs. Vespers, Book 5) - Library Edition
Linda Sue Park
Medusa Plot (the 39 Clues: Cahills vs. Vespers, Book 1)
Gordon Korman
Medusa Plot (the 39 Clues: Cahills vs. Vespers, Book 1)
Gordon Korman
Details
Book Length
- ISBN
- 9780545522878
- Pages
- 257
- Publisher
- Scholastic Inc.
- Published
- 2011-01-10
- Type
- Fiction