Sisters of glass
Naomi Cyprus
Sisters of glass
Age Rating, Reading Level & Content Guide
by Naomi Cyprus
The text is written at a 7th 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 crackle of ancient magic hums through the desert air, warm and alive beneath the blazing sun. Across a forbidden land where glass gleams cold and clear, a secret power stirs quietly inside a young girl. When a shimmering mirror links their worlds, two very different sisters must face fear and hope together, discovering what it truly means to be strong.
Themes
Quick Assessment
Sisters of Glass is a middle-grade fantasy novel about two girls from contrasting worlds—one a powerless princess in a magical desert kingdom, the other a glassblower’s daughter from a land where magic is banned. The story explores themes of family, identity, and cooperation as the girls unite to save their worlds. Appropriate for ages 9-12, it contains mild fantasy peril and emphasizes positive messages about courage and self-discovery.
Why we rated Sisters of glass 12LE
Sisters of glass is written at a Level 7 reading level across 377 pages. Strong independent readers around grade 8.0 can typically handle this book on their own; with parent or teacher support, Sisters of glass works for readers up to grade 9.0.
We rate Sisters of glass 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, Sisters of glass explores fantasy, magic, princesses, sisters, and adventure — 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.
- ✓ Patient readers who enjoy slower, character-driven stories.
- ✓ Kids drawn to stories about fantasy, magic, princesses.
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.
- ! Reluctant readers who need a fast hook — the pacing here rewards patience.
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
2/10A 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
- 9780062458476
- Pages
- 377
- Publisher
- HarperCollins
- Published
- 2017
- Type
- Fiction