For a reader who just finished
Books like My Husband's Wife
after My Husband's Wife by Alice Feeney

Nonfiction
This is adult psychological thriller/domestic suspense, far outside the Parentkin 5–9 target band; flagged for transparency.
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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.