When random killings start happening around Centerville, Marvin (Marv) Henderson, Centerville's retired large-animal vet, now cowboy coroner, begins to see links that point to a serial killer with an unknown motive. With his friend, an elderly lady named Annemarie Smith, being one of the victims, nothing will stop Marv in his efforts to bring her murderer to justice, even when his own life is danger.