Three men ride into a valley from different directions for a meeting. Bronco arrives first to meet U.S. Marshal John Heyes who requested him. In short time Butch Cassidy and then Billy Doolin, both well known outlaws, arrive. Heyes has asked them there to agree to a truce between themselves and their gangs for three days in the town of Painted Rock for the wedding of Butch's niece Ella Cassidy to Billy's brother Bob. The men reluctantly agree with the understanding that Bronco will be there and have the final authority. In Painted Rock Sheriff Steve Gage is meeting with the town mayor and saloon owner Jim Morgan about the issue. They stand to make money from it but the Sheriff is quite reluctant to have the outlaw gangs in town. Bronco arrives to inform the Sheriff he will be in charge of controlling the situation. During the meeting, Toothy Thompson, a seedy local is listening from his jail cell. Knowing the outlaws he offers his help after being released. Unknown to Bronco, Toothy ...