Starsky and Hutch are assigned to protect a criminal who's supposed to testify against his associates. But someone kills him. Later the man who kills him claims to have no remorse because the man killed his wife. But when they check him they find out that he doesn't exist and neither did his wife. And when he tries to show them all the things he remembers like the hospital he was in, which turns out to be a convent. And the bank account he withdrew from which doesn't exist. They wonder what is going on.