J.D. Cahill is the toughest U.S. Marshal they've got, just the sound of his name makes bad guys stop in their tracks, so when his two young boy's want to get his attention they decide to rob a bank. They end up getting more than they bargained for.

Clearly influenced by the darker, more sinister style of spaghetti westerns, Dirty Little Billy offers a unique insight into the beginnings of the notorious outlaw Billy The Kid.