6 Books Found

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Based on your description:

"Younger sister goes on magical quest to find cure for dying older sister. Two princess sisters one is sick"

August 10, 2026

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Likely answer

Fantasy Novels Featuring a Quest to Save a Sick Sister

The book you are looking for is "The Two Princesses of Bamarre" by Gail Carson Levine. It follows Princess Addie, a timid girl who must find the courage to go on a dangerous magical quest to find the cure for Grey Death, a fatal illness that has stricken her brave older sister, Meryl. The story features dragons, specters, and magical items used to save the kingdom of Bamarre.

Confirmed match: Two Princesses Of Bamarre by Gail Carson Levine