When Jimmy Markum's daughter is found murdered, his childhood friend Sean Devine--now a detective--is assigned to the case. Sean's personal life starts unraveling, as his investigation takes him back into a world of violence and pain he thought he'd left behind. It also puts him on a collision course with Jimmy Markum, a man with his own mysterious dark past, who is now eager to solve the crime with brutal justice. And then there is Dave Boyle, a man who hides monstrous secrets beneath a bland facade--secrets that his wife, Celeste, is only beginning to suspect. As the race for a killer heats up, all are pulled closer toward an abyss that will force them to face their true selves--and will mark them as irrevocably, as the past itself has tainted their lives.