Kyle Malachi, better known by his mystery critic pseudonym of Stokes Moran, is enjoying a quiet evening at home with his literary agent wife Lee Holland and his dog Bootsie when a simple knock on the door announces a series of surprises that change Kyle's life forever. Standing on the threshold is Kyle's spitting image. The visitor, Derek Winslow, claims he is Kyle's twin brother, a twin Kyle never knew existed. Even more shocking to Kyle, Derek says Kyle was adopted. Far from welcoming the prodigal brother, Kyle rejects his claims and orders him off his property. Surely his assertions could not be true! Or could they? Calmed by Lee, Kyle realizes that perhaps he acted too rashly. He should give Derek another chance. But it's too late. When Kyle arrives at Derek's motel, Derek is dead. Who could have wanted to kill the man Kyle now believes may have been his brother? There is one way to find out: Kyle will assume Derek's identity and move into his world. Won't the killer be surprised when Kyle/Derek reappears on the scene, healthy and vigorous and eager to trap a villain?