The Mark on the Door (Hardy Boys, Book 13)
Franklin W. Dixon
The Mark on the Door (Hardy Boys, Book 13)
Age Rating, Reading Level & Content Guide
by Franklin W. Dixon
Illustrated by J. Clemens Gretta
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.
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About This Book
Here's a secret: a mysterious mark on a door is the key to finding a missing boat. Frank and Joe Hardy follow clues all the way to Mexico, where a hidden tribe holds answers—but that's only the beginning of their adventure.
Themes
Quick Assessment
This middle-grade mystery follows the Hardy Boys as they investigate a missing boat, leading them to Mexico and an encounter with a native tribe. Suitable for ages 9-12, the story involves suspense and cultural exploration typical of juvenile detective fiction, with no intense content concerns.
Why we rated The Mark on the Door (Hardy Boys, Book 13) 11LP
The Mark on the Door (Hardy Boys, Book 13) is written at a Level 6 reading level across 219 pages. Strong independent readers around grade 7.0 can typically handle this book on their own; with parent or teacher support, The Mark on the Door (Hardy Boys, Book 13) works for readers up to grade 8.0.
We rate The Mark on the Door (Hardy Boys, Book 13) 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.
No specific content flags were raised by community reviewers, which is consistent with the mild intensity score.
Thematically, The Mark on the Door (Hardy Boys, Book 13) explores mystery, adventure, friendship, juvenile mysteries, and cultural exploration — 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 mystery, adventure, friendship.
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.
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
1/10A lighter read — great for independent enjoyment.
Book DNA
Multi-dimensional content fingerprint
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Details
Book Length
- ISBN
- 9781557092717
- Pages
- 219
- Publisher
- Applewood Books
- Published
- December 1, 2001
- Type
- Fiction