Zack Thomas and Joe Jarrett separately are heading for Galveston in 1870 and witness a stagecoach attack by a gang on horseback led by Matson, a local gunslinger. After repulsing the bandits, Zack discloses a bag containing $100,000, but Joe relieves him of the money at gunpoint and proceeds to an orphanage where he was reared. He later deposits the loot in a bank run by Harvey Burden, a crook who has supported Zack in his efforts to become the town's gambling boss. Zack learns that Joe is in Galveston, and he arranges a meeting but is interrupted when Matson attempts to kill Zack. Joe wounds the bandit, thus saving his rival's life, and then goes off to see Maxine Richter, owner of a riverboat which Joe plans to refurbish as a gambling saloon. Outraged that anyone would dare to give him competition, Zack plans for his gang to take over the boat on opening night. Unknown to both men, however, Burden has decided to let the gangs destroy each other so he can move in with Matson's bandits and take control. Maxine and Elya Carlson, Zack's devoted girl friend, persuade the two gamblers to join forces. As a result of the alliance, Matson's gang is defeated, Burden is arrested, and the women get their reward at a double wedding.