Bodies are dropping, but Mace Franklyn, now the target of a long-dormant serial killer, the Vulcan, argues there are no murders. He led the FBI's hunt for the Vulcan, but when encephalitis sidelined his career and threatened his marriage, he took desperate measures, that have returned to haunt him. Mace knows it's not the Vulcan, but proving it may expose his guilt. Anstice, a beautiful Detroit police detective, picks up on his fears. She, and Mace's former FBI boss, both have reasons to prove Mace wrong about the murders, and their motives have nothing to do with finding the serial killer.