A trio of bank robbers forces Lucas to help them rob the North Fork Bank by holding Mark hostage and threatening to kill him, if Lucas does not cooperate with them. Leaving one man behind to guard Mark, the other two take Lucas into town and successfully pull off the robbery. Mark, in the meantime, tries to escape his guard, but falls and strikes his head. When Lucas returns to the ranch and finds Mark unconscious, he is determined to find the criminals. After calling a doctor to look after Mark, he sets out on the trail. He finds three outlaws and forces them to start walking back to North Fork. Consumed by desire for revenge, Lucas nearly makes a terrible mistake.