At 34, Ryan Perry never expected to find himself on a waiting list for a heart transplant, with time running out...

So when miraculously he receives a new heart and the transplant is a success, he thinks his troubles are over. A year later, he has never felt so good.

And then comes a terrifying threat: everything he has - his money, his reputation, his friends, 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?