During a bank robbery, Joe Madison, one of the robbers, is seriously wounded. Frank Dillon, the head of the gang, takes Joe to a doctor for treatment, but when the doctor tries to warn the police, Dillon kills him. While the rest of the gang takes Joe to a hideout in the mountains, one gangster brings Joe's sister Nora, a nurse, to care for her brother. Telling the local doctor, Steven Bishop, that Joe was wounded in a hunting accident, Dillon persuades him to treat the injured man. With Nora's help, Steve performs emergency brain surgery, but afterward Joe's prognosis is poor. Dillon offers Steve a large salary and his own lab if he will stay at the hideout and take care of Joe, but privately, Dillon warns Nora that he will kill Steve if he learns the truth about Joe's injury. Slowly, Steve becomes aware that he and Nora are being closely guarded and are only allowed to travel to town if they are accompanied by one of the gang. On one such trip, a policeman mentions the bank robbery, and Nora whispers to Steve that Dillon's men committed the crime. When Joe develops a serious infection, Nora tells Steve that if Joe dies, Dillon will kill him. Steve and Nora nurse Joe through the night, but despite their efforts, he dies in the morning. They decide to keep the news of Joe's death from Dillon as long as possible. Pretending that he needs to fill a prescription, Steve writes a plea for help in Latin and sends a gang member to town with it. When Dillon discovers that Joe is dead, Steve and Nora make a break for safety. They are involved in a gunfight with the gang when the police arrive and overcome the gang. Nora and Steve, who have fallen in love, will now marry.