What makes a man walk into a restaurant on a bright, beautiful Memorial Day afternoon in a small Arizona town, pull out a gun and shoot forty people before killing himself? That's what Sam Tryor is trying to figure out. Only he's trying to figure it out from beyond the grave. Instead of a who-dun-it, this mystery is a what-made him-do-it. With the help of a gorgeous reporter, a world-weary cop, and his own brother, Sam seeks the reason for his horrific crime, and his search leads him to a conclusion that is as disturbing for what it reveals about us as it is shocking for what it reveals about him.