The kaleidoscope sisters

Tells the story of ". . . fifteen-year-old Quinn and her younger sister, Riley, who is dying from a degenerative heart defect . . . Riley is weeks away from her seventh birthday, and her decline is obvious. Years in and out of hospitals have left the family with no support system, but Quinn is determined to save her younger sister. In her quest, Quinn discovers a portal to another realm peppered with characters based in history, all of whom disappeared mysteriously. Aiding Quinn throughout her journey in the Other Realm is Meelie. Quinn learns that a new heart for Riley can be harvested in the Other Realm, but not without sacrifice"--Provided by publisher.