Colin O'Brien's past has come back to haunt him. Free from his role as international assassin Angus McDowell, Colin takes his wife on a relaxing vacation to Las Vegas. Less than 24 hours into their trip, Colin spots a team of suicide bombers entering the hotel and casino they're in and has no choice but to take action. This time, though, he is the one being hunted. Not only has Colin become the face of the assassin known around the world, but now he is forced to reconcile the past indiscretions of the real McDowell. Left alone, bloody, and battered in Sin City, he is hunted by a powerful terrorist and the local branch of the FBI. He'll have to pull off one last hit if he expects to make it out alive. Allies from federal agencies swarm the town, including the men who drew him into playing the part of McDowell. He'll have to balance his relationships with his friends, his wife, and Las Vegas' most powerful mob boss to stay alive and free, as well as battle the demons that begin to form inside the mind of a killer. A killer by circumstance, but still a killer.