Bad machinery
John Allison
Bad machinery
Age Rating, Reading Level & Content Guide
The Case of the Simple Soul
by John Allison
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
What secrets are hiding in the small town of Tackleford? A group of young detectives is on the trail of mysterious fires, but can they solve the case before their own teenage dramas get in the way? Danger and friendship collide in ways no one expected.
Themes
Quick Assessment
This middle-grade graphic novel follows a group of young private investigators in a small town as they try to solve a string of arson cases. Alongside the mystery, the story explores themes of friendship and growing up, with some mild romantic elements typical for ages 9-12. The content is appropriate for middle-grade readers, with no intense violence or mature themes.
Why we rated Bad machinery 9LE
Bad machinery is written at a Level 4-5 reading level across 131 pages. Strong independent readers around grade 5.5 can typically handle this book on their own; with parent or teacher support, Bad machinery works for readers up to grade 6.5.
We rate Bad machinery as 9LE ("Light — Emotional") 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, Bad machinery explores friendship, adventure, mystery, coming of age, and graphic novels — 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 friendship, adventure, mystery.
- ✓ Curious kids who prefer real-world topics over made-up stories.
Maybe not for
- ! Readers looking for something heavier — this is a gentle, low-stakes story by design.
For Parents
Content Intensity
9LE — Light — EmotionalLight 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
Bad Machinery Vol. 1
John Allison
Bad Machinery Vol. 1
John Allison
How to be bad
E. Lockhart
How to be bad
E. Lockhart
How to be bad
E. Lockhart
How to be bad
E. Lockhart
Bad Circuits
Marty M. Engle
Bad Circuits
Marty M. Engle
Trouble on wheels
Ann Aveling
Trouble on wheels
Ann Aveling
Bad trip.
Kelley Roos
Bad trip.
Kelley Roos
Details
Book Length
- ISBN
- 9781620101933
- Pages
- 131
- Publisher
- Oni Press
- Published
- 2014
- Type
- Nonfiction