Oath on AllMovie

When Miriam Cooper read William J. Locke's Idols, she begged her husband, director Raoul Walsh, to make a film of it with her in the lead. Playboy Hugh Coleman (Conway Tearle) is disconsolate when he discovers that Irene Lansing (Anna Q. Nilsson) is engaged to his best friend, Gerald Merriam (illustrator Henry Clive, who occasionally liked to act). To ease his depression, Coleman secretly marries Minna Hart (Cooper), the daughter of a Jewish banker (Robert Fischer). When Coleman runs through his money, the banker gives him a loan. Minna urges him to talk to her father about their relationship, but it turns out that Hart does not want his daughter marrying a Christian. Coleman does not put up an argument, and Minna is furious. When he comes up to her room, she tells him they are through, and makes him swear to never reveal the marriage to anyone. The next day Hart is found dead. Since Coleman refuses to reveal his whereabouts at the time of the murder -- because he was with Minna -- he looks like the guilty party. Minna refuses to reveal anything either. Finally Irene comes forth and claims that Coleman was with her. Eventually Minna and Coleman resolve their differences.