The Mona Lisa key
Liesl Shurtliff
The Mona Lisa key
Age Rating, Reading Level & Content Guide
by Liesl Shurtliff
The text is written at a 8th 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
The clatter of wooden decks and the salty tang of the sea fill the air as Mateo, Ruby, and Corey suddenly find themselves not on a subway, but aboard a creaking pirate ship in 1911 Paris. The city's secrets swirl around them, mixing with whispers of stolen art and hidden family mysteries. Every step they take pulls them deeper into a thrilling adventure where time itself feels alive and full of surprises.
Themes
Quick Assessment
This middle-grade adventure follows three siblings who accidentally travel back in time to 1911 Paris aboard a mysterious ship. The story explores themes of family, history, and mystery with engaging, age-appropriate content suitable for readers ages 9-12. It combines imaginative time travel with a fast-paced plot centered on an art heist, offering both excitement and opportunities for critical thinking without any intense content.
Why we rated The Mona Lisa key 12LE
The Mona Lisa key is written at a Level 8 reading level across 400 pages. Strong independent readers around grade 9.0 can typically handle this book on their own; with parent or teacher support, The Mona Lisa key works for readers up to grade 10.0.
We rate The Mona Lisa key as 12LE ("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, The Mona Lisa key explores adventure, family, time travel, mystery, and historical — 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, family, time travel.
Maybe not for
- ! Readers whose emotional readiness lags behind their decoding skills — this book's intensity outruns its reading level, a classic "gifted kid" mismatch.
For Parents
Content Intensity
12LE — 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
3/10A lighter read — great for independent enjoyment.
Book DNA
Multi-dimensional content fingerprint
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Details
Book Length
- ISBN
- 9780062568137
- Pages
- 400
- Publisher
- Katherine Tegen Books
- Published
- 2018
- Type
- Fiction