In the tiny town of Patience, California, newcomer Dr. Abby Dolan has noticed a frightening syndrome among her emergency room patients. It begins with a baffling, seemingly minor set of symptoms, but builds relentlessly until it plunges its victims into insane, murderous rages. As she searches for clues to this deadly mystery, Abby's superiors make it clear her probing is unwelcome. Soon Abby will learn just how high the cost of the truth may be—and how far someone will go to keep a lethal secret. But she may not find the answer until it's too late to save her patients, her career...her life.