Outside Denver, Colorado, Beau and his friend, Judge Scott, find shelter during a blizzard at the home of Martha Flood and her niece Sally. Martha and the judge are plotting to institutionalize Sally in order to take over her inheritance. However, Martha's lover, a professional killer named Chet Whitehead plans to kill Sally, the judge, and Maverick.

Beau Maverick stumbles onto the cave site meeting place of five outlaws. They were summoned by a bandit named Jess in order to plan a big job. Mavrick passes himself as the notorious Texas outlaw Red Dog. The outlaws become suspicious of Beau when he declines to join them in a $500,000 bank robbery scheme.