Having to support her impoverished family, Grace Tyler poses for artist Michael Arnold, who seduces his new model and then leaves her. A few years later, after Grace has married the wealthy John Marshall, her sister Ruth, repeating Grace's mistake, becomes involved with Michael. Grace tries to break up the romance, until Michael threatens to expose their own affair to John, who has already become somewhat suspicious. Determined to learn the truth about his wife and Michael, John goes to the artist's studio while Grace and Ruth are also there, then, after a brief struggle, Michael dies from a knife wound. John is accused of the murder, but just before a jury convicts him, Ruth confesses to the crime and the court quickly acquits her because she had been defending her honor against Michael's advances.