How well do you know the person sitting next to you? For crime writer Ann Rule, the answer became a nightmare. While investigating a series of brutal murders, she befriended a charming and intelligent man named Ted at a crisis hotline. They were colleagues, confidants. But as the manhunt for a cunning serial killer intensified, Rule was forced to confront a horrifying truth: the friend she trusted was the monster she was hunting. This is the chilling true story of the evil that hides in plain sight.