Onyx

Onyx is written at a Level 4-5 reading level across 421 pages (approximately 112,904 words). Strong independent readers around grade 5.4 can typically handle this book on their own; with parent or teacher support, Onyx works for readers up to grade 6.4.

Read aloud, Onyx runs about 12.6 hours — long enough to span several bedtime sessions.

We rate Onyx as 9ME ("Moderate — Emotional") 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, social complexity — these are the dimensions parents should evaluate against their reader's tolerance.

Specific content flags noted by reviewers: Mild Peril, Romantic Content, Fear & Anxiety.

Thematically, Onyx explores science & nature, romance, adventure, friendship, and coming of age — these threads give the book room to mean different things to different readers.