Heart of iron
Ashley Poston
Heart of iron
Age Rating, Reading Level & Content Guide
by Ashley Poston
Heart of Iron
The text is written at a 5th grade reading level, the subject matter is intended for teens (ages 13+), and the content has moderate intensity with some emotionally heavy themes.
We may earn a commission from these links. Bookshop.org supports independent bookstores with every purchase.
About This Book
Seventeen-year-old Ana, raised among space outlaws and accompanied by a sentient android named D09, embarks on a daring mission to save her glitching companion. Her quest for a lost ship's coordinates pits her against a determined Ironblood boy, thrusting them both into a dangerous chase across the stars. As secrets unravel and old enemies resurface, Ana must decide between saving a kingdom that despises her or protecting the boy she loves.
Themes
Quick Assessment
This is a Level 5-6 book with moderate content intensity. Content themes include romantic content, physical danger, emotional: identity & self-discovery. Written for readers ages 13+.
Why we rated Heart of iron 10MP
Heart of iron is written at a Level 5-6 reading level across 467 pages (approximately 100,057 words). Strong independent readers around grade 6.4 can typically handle this book on their own; with parent or teacher support, Heart of iron works for readers up to grade 7.4.
Read aloud, Heart of iron runs about 11.1 hours — long enough to span several bedtime sessions.
We rate Heart of iron as 10MP ("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 physical peril, social complexity — these are the dimensions parents should evaluate against their reader's tolerance.
Specific content flags noted by reviewers: Romantic Content, Physical Danger, Emotional: Identity & Self-Discovery.
Thematically, Heart of iron explores science & nature, adventure, romance, identity, and family — these threads give the book room to mean different things to different readers.
Good fit for
- ✓ Children in the Ages 13+ range — the maturity and attention span match the story's pacing.
- ✓ Readers who like a steady plot with enough momentum to keep pages turning.
- ✓ Readers ready to talk through themes after they finish — there's enough substance for a meaningful conversation.
- ✓ Kids drawn to stories about science & nature, adventure, romance.
Maybe not for
- ! Readers who get easily upset by emotional or moderately dark scenes — the conflict here is real, not just background flavor.
For Parents
Content Intensity
10MP — Moderate — PhysicalReal stakes and emotional weight. May include sustained danger, loss, or bullying.
Content Flags
Was our "Moderate" content intensity rating accurate for this book?
Reading Insights
Hook Factor
5/10Engaging read with solid pacing and interesting themes.
Discussion Potential
4/10Good conversation starter with themes worth exploring together.
Book DNA
Multi-dimensional content fingerprint
Similar Books
Based on content and theme analysis
The iron traitor
Julie Kagawa
The iron traitor
Julie Kagawa
Iron to Iron
Ryan Graudin
Iron to Iron
Ryan Graudin
Iron King
Julie Kagawa
Iron King
Julie Kagawa
Iron Town Boy
Anne Ahmad
Iron Town Boy
Anne Ahmad
Heart of the harbor
Katrinka Blickle
Heart of the harbor
Katrinka Blickle
Heart of an Assassin
Laura Pauling
Heart of an Assassin
Laura Pauling
Details
Book Length
- ISBN
- 9780062652850
- Pages
- 467
- Publisher
- Balzer + Bray
- Published
- 2018
- Type
- Fiction
- Word Count
- 100,057
- Read-Aloud
- ~11h 7m
- Text Density
- Standard