7 Books Found

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Based on your description:

"a story about kids who are stranded on an island and eat mangosteens - it ends when they're back and the main character (POV) shoots someone and describes how easy pulling the trigger felt"

July 10, 2026

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Likely answer

Gordon Korman's Island Trilogy: Shipwreck, Survival, and Escape

The remembered story is Gordon Korman's Island trilogy, which begins with Shipwreck and concludes with Escape. Six young people are stranded and must survive on a remote island. The mangosteens and final shooting scene point to the later volumes, making Escape the best single-volume answer.

Confirmed match: Escape by Gordon Korman