The 39 Clues
Peter Lerangis
The 39 Clues
Age Rating, Reading Level & Content Guide
The Sword Thief
by Peter Lerangis
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.
We may earn a commission from these links. Bookshop.org supports independent bookstores with every purchase.
About This Book
Amy and Dan race through shadowy streets, clutching a mysterious clue that could change everything. Alistair lurks nearby, his true intentions hidden beneath a crafty smile. Suddenly, danger strikes — but who is the real threat?
Quick Assessment
This middle-grade adventure follows siblings Amy and Dan Cahill as they unravel secrets tied to their powerful family legacy. The story involves suspense, mild peril, and puzzles suitable for children ages 9 to 12. Parents should note the presence of chase scenes and moments of tension, but no graphic content.
Why we rated The 39 Clues 9LP
The 39 Clues is written at a Level 4-5 reading level across 156 pages. Strong independent readers around grade 5.5 can typically handle this book on their own; with parent or teacher support, The 39 Clues works for readers up to grade 6.5.
We rate The 39 Clues 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 39 Clues explores adventure, mystery, and family — 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, mystery, family.
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
2/10A 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
The mystery
Garth Nix
The mystery
Garth Nix
Clue in the Papyrus Scroll
Gertrude Chandler Warner
Clue in the Papyrus Scroll
Gertrude Chandler Warner
The 39 Clues
Riley Clifford
The 39 Clues
Riley Clifford
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
Details
Book Length
- ISBN
- 9780545341325
- Pages
- 156
- Publisher
- scholastic
- Published
- 2011
- Type
- Fiction