Psychologist Jonah Singer has a few issues of his own. He has obsessive-compulsive disorder, chain smokes, and is haunted by a blurry past with a crazy mother. Enter Tate Powers, a mental-health counselor with a wicked laugh and uncanny ability to get inside Jonah's head. Tate shows him the path to the most horrific depths of the human psyche. Inside his mind, Jonah will find much more than the tools to heal. He'll engage in a battle that goes far beyond him, with ramifications for the entire planet.