Down and Out in Purgatory

In college, Tom Holbrook worshipped Shasta DiMaio from afar, but she married the arrogant John Atwater--and Atwater eventually murdered her. All that's left for Tom is revenge. He has devoted the rest of his life to finding Atwater and killing him--but when he finally finds him, Atwater is in a bag in the Los Angeles County morgue. How do you kill a man who has already died?