There is a serial killer prowling the streets of New York, killing seemingly unconnected people. A rookie cop is teamed up with a grizzled old hand on his last case. He thinks the killer is a sicko but the rookie finds something suspicious about the victims. Following a hunch she discovers that the serial killer is preying on fellow serial killers. Trailing a potential victim she is killed by the man she is ostensibly protecting. The villain of the piece then kills him as the old hand arrives on the scene. The serial killer pleads for his life, saying that he is only doing good. The film ends with the cop holding a gun to the head of the serial killer whilst backup arrives. As the credits scroll a single gunshot is heard.