Bob Allers, an unfortunate consumptive, and his wife are traveling to Arizona for medicinal purposes. On the way, a highwayman robs them of horse and money. Destitute, they are befriended by William "Red" Saunders, whose sympathy and innate love for his fellow man lands Allers a job in the local saloon. Soon after, when the same highwayman attempts to rob the saloon, Allers kills him with a hammer thrown in self-defense, unaware that the outlaw is the brother of the sheriff. Convicted for murder by the vengeful sheriff, Allers is defended by "Red." The corrupt jury makes its final decision based on whether a crawling fly reaches the top of a window pane. Allers is acquitted, then reunited with his happy wife and newborn child, and they all leave together.