The underground

The underground is written at a Level 4-5 reading level across 130 pages (approximately 19,105 words). Strong independent readers around grade 5.1 can typically handle this book on their own; with parent or teacher support, The underground works for readers up to grade 6.1.

Read aloud, The underground runs about 2.1 hours — long enough to span several bedtime sessions.

We rate The underground as 9IE ("Intense — Emotional") because the content sits in the "Intense" range — intense conflict including peril, frightening scenes, or emotionally heavy themes. The strongest signals come from emotional weight, physical peril — these are the dimensions parents should evaluate against their reader's tolerance.

Specific content flags noted by reviewers: Emotional: Loss & Grief, Physical/Safety: Injury & Trauma, Physical/Safety: Kidnapping, Physical/Safety: Death, Physical/Safety: Graphic Violence.

Thematically, The underground explores friendship, adventure, survival, and family — these threads give the book room to mean different things to different readers.