At thirty-four, Internet entrepreneur Zachary Cohen seemed to have the world in his pocket-until the first troubling symptoms appeared out of nowhere. Within days, he's diagnosed with incurable cardiomyopathy and finds himself on the waiting list for a heart transplant; it's his only hope, and it's dwindling fast. Zachary is about to lose it all...his health, his girlfriend Brianna, and his life. One year later, Zachary has never felt better. Business is good and he hopes to renew his relationship with Brianna. Then the unmarked gifts begin to appear-a box of Valentine candy hearts, a heart pendant. Most disturbing of all, a graphic heart surgery video and the chilling message: Your heart belongs to me. In a heartbeat, the medical miracle that gave Zachary a second chance at life is about to become a curse worse than death. For Zachary is being stalked by a mysterious woman who feels entitled to everything he has. She's the spitting image of the twenty-six-year-old donor of the heart beating steadily in Zachary's own chest. And she's come to take it back.