For a reader who just finished
Books like And Then There Were None
after And Then There Were None by Agatha Christie

Nonfiction · 1100L
This is an adult mystery thriller — ten strangers systematically murdered on an island — and belongs in the 14+ band only for exceptional readers with mature content tolerance; not a children's book.
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by Charles Dickens
Nonfiction · ages 8–12 · grades 3–7 · 1070L
The original text is denser than modern adaptations, but the Gothic pacing and genuine stakes (Tiny Tim might die) grip kids; worth the stretch with a parent nearby for first read.
T
by Stephen G. Bloom
Nonfiction · 1100L
A genuinely unusual nonfiction book for this age — haunting portraits and short biographies that teach kids to see dignity in ordinary rural lives and ask better questions about who deserves to be remembered.

by Steven Levitt & Stephen Dubner
Nonfiction · 1100L
A genuinely clever introduction to incentive-based thinking—the wit keeps it readable, but the content is demanding; best for a curious 13+ reader ready to question assumptions.