From the #1 New York Times bestselling master of suspense comes a riveting thriller that probes the deepest terrors of the human psyche—and the ineffable mystery of what truly makes us who we are.

Here a brilliant young man finds himself fighting for his very existence in a battle that starts with the most frightening words of all…

Further suggestions might be found on the article's talk page.At thirty-four, Internet entrepreneur Ryan Perry 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.

In a heartbeat, the medical miracle that gave Ryan a second chance at life is about to become a curse worse than death.