 Billy is a bank robber who deceives the rest of his outlaw gang and comes to North Fork so that he can see his mother as she passes through on the stage. He has been deceiving his mother into thinking that he is legitimate and has a son who is Mark s age. In order to maintain his story, he holds Lucas and Mark at gunpoint so that Mark will pose as his son. His mother arrives, but turns out to be dying. To make matters worse, Billy s outlaw associates surround him and the others at Lucas s ranch house. Lucas helps Billy to make the most difficult decision of his life.