Invisible sun
David Macinnis Gill
Invisible sun
Age Rating, Reading Level & Content Guide
by David Macinnis Gill
The text is written at a 7th grade reading level, the subject matter is intended for middle graders (ages 9–12), and the content has moderate intensity with some emotionally heavy themes.
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About This Book
Mars explodes around Durango as he sprints through fire and flood, his breath ragged and his heart pounding. His crew is gone, his father lost, but Vienne stands by him—for now. With danger closing in, will Durango uncover the secrets before it's too late?
Quick Assessment
Invisible Sun is a thrilling middle-grade science fiction adventure set on a hostile Mars. The story follows Durango, a young mercenary who must navigate perilous environments and dangerous foes while uncovering a secret government project. Suitable for ages 9-12, it contains scenes of action and peril but is appropriate for readers who enjoy fast-paced, suspenseful stories.
Why we rated Invisible sun 12MP
Invisible sun is written at a Level 7 reading level across 388 pages. Strong independent readers around grade 8.0 can typically handle this book on their own; with parent or teacher support, Invisible sun works for readers up to grade 9.0.
We rate Invisible sun as 12MP ("Moderate — Physical") because the content sits in the "Moderate" range — moderate conflict that may involve loss, scary scenes, or interpersonal stakes. The strongest signals come from emotional weight, physical peril — these are the dimensions parents should evaluate against their reader's tolerance.
No specific content flags were raised by community reviewers, which is consistent with the moderate intensity score.
Thematically, Invisible sun explores science & nature, adventure, friendship, and survival — 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 science & nature, adventure, friendship.
Maybe not for
- ! Readers who get easily upset by emotional or moderately dark scenes — the conflict here is real, not just background flavor.
- ! Reluctant readers who need a fast hook — the pacing here rewards patience.
For Parents
Content Intensity
12MP — Moderate — PhysicalReal stakes and emotional weight. May include sustained danger, loss, or bullying.
Was our "Moderate" content intensity rating accurate for this book?
Reading Insights
Hook Factor
2/10A steady, thoughtful read that rewards patient readers.
Discussion Potential
2/10A lighter read — great for independent enjoyment.
Book DNA
Multi-dimensional content fingerprint
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Details
Book Length
- ISBN
- 9780062073334
- Pages
- 388
- Publisher
- Greenwillow Books
- Published
- 2013
- Type
- Fiction