For a reader who just finished
Books like Murder on the Orient Express
after Murder on the Orient Express by Agatha Christie

Nonfiction
This is an adult literary mystery novel, outside the 5–9 target band entirely — not recommended for this age group.
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by Aranka Siegal
Nonfiction · ages 10–14 · grades 5–9 · 840L
A masterwork of Holocaust memoir written in a child's voice—unflinching about fear and loss, but grounded in the texture of ordinary summers, school, and family that make the encroaching darkness undeniable.

by Deborah Hopkinson
Nonfiction · ages 9–12 · grades 4–7 · 680L
Hopkinson's mosaic of real voices makes the Titanic human in a way no single narrative can—kids grasp both the tragedy and the class inequality that sealed third-class fates in minutes.

by Carl Sagan
Nonfiction
A 1980 classic that still holds — Sagan's measured wonder and clarity about the scale of the universe can genuinely shift how a curious 10+ kid sees their place in it.