I Am the Law (1922)

Royal Mounted Policeman Robert Fitzgerald, rescues Joan Cameron from the evil clutches of dance-hall owner Fu Chang, but she falls in love with Tom, Robert's brother, who is carrying on an affair with another officer's wife. Discovered by the husband, Tom apparently kills him; and Bob, believing himself to be dying and that Joan loves Tom, assumes responsibility for the crime and signs a confession. Although Bob recovers, his brother announces his death. When Bob reappears, Tom arrests him; and Bob is about to be lynched when Joan forces a confession from the widow of the slain officer. Tom commits suicide, and Joan realizes her love for Bob.