At 34, Ryan Perry is on a waiting list for a heart transplant, and time's running out. When, miraculously, he receives a new heart and the transplant is a success, he thinks his troubles are over. But a year later, he starts to receive heart-shaped gifts - sent anonymously. $100,000 suddenly vanishes from his bank account and is donated to the cardiology department of the local hospital. And then comes a terrifying threat: everything he has - his money, his freedom, and his new heart - will all be ripped away from him. He is promised a nightmare death. In grave danger, alone with his beating heart and its secrets, can Ryan unlock the mystery of the enemy who threatens his very existence?