When Simon Johnson is attacked in his LA apartment, he knows he must defend himself or die. Turning on the lights afterwards, he discovers that his attacker is dead and the resemblance of the man to himself is uncanny. Soon his lonely life will spiral out of control. But Simon has a plan. He assumes the dead man's identity, fooling his attacker's colleagues, and even his wife. However, when mysterious messages appear on his apartment walls, he realizes that losing his old self will get ever more difficult. And, as the contradictions mount, events resolve themselves in a catastrophic way.