Seventeen-year-old Leah MacKenzie uses an artificial heart to stay alive, and due to a rare blood type, finding a donor heart is difficult. But when she does get a transplant, she learns that the heart is from a boy at her school who supposedly committed suicide. She begins having vivid dreams, which may hold clues to what actually happened, and that the boy may not have committed suicide at all.

On title page the word heart is represented by a picture of a heart.