Growing up on Catalina Island, off the California coast, Scarlett Wenderoth has led a fairly isolated life. After her brother dies, her isolation deepens as she withdraws into herself, shutting out her friends and boyfriend. Her parents, shattered by their own sorrow, fail to notice Scarlett's pain and sudden alarming thinness. Scarlett finds pleasure only on her horse, escaping to the heart of the island on long, solitary rides. One day, as she races around a bend, Scarlett is startled by a boy who raises his hand in warning and says one word: "Stop." The boy--intense, beautiful--is Will Cohen, a newcomer to the island. For reasons he can't or won't explain, he's drawn to Scarlett and feels compelled to keep her safe. To keep her from wasting away. His meddling irritates Scarlett, though she can't deny her attraction to him. As their relationship blossoms into love, Scarlett's body slowly awakens at Will's touch. But just when her grief begins to ebb, she makes a startling discovery about Will, a discovery he's been grappling with himself. A discovery that threatens to force them apart. And if it does, Scarlett fears she will unravel all over again.