Businessmen Gordon Creed and Myron Galt and Galt's daughter Lola are all on a train bound for north China where bandit Wu Yen Fang is threatening the populace. Although the apparent purpose of Gordon's trip is a visit to his estranged wife Jane, who is working as a medical missionary, his ulterior motive is to become a partner in Jim Hallet's oil fields. Galt is also traveling to the oil fields. He loaned Jim the money to begin drilling, and as Jim defaulted on the loan, Galt intends to take over the fields. During their trip, General Chow Fu-Shan, a soldier fighting the bandits, is killed, and the three Americans are questioned by the police before they set off by mule train for the north. Jim meets them and directs them to the medical mission, as Fang is dangerously active further north. No sooner have they arrived at the mission, where it is apparent that Jane and Jim are in love, than Fang attacks. Out of gratitude to Jim for having once saved his life, Fang tries to solve Jim's problems. After putting down a rebellion fomented by Gordon, Fang kills him. A spy alerts Chinese troops to Fang's presence at the mission, and during the ensuing battle, Fang surrenders to the soldiers and is executed. Now that Gordon is dead, Jane is free to marry Jim.