Shortly after his marriage, Wilton receives a letter which apparently causes him great anxiety. He vouchsafes no information to his wife Bella, who becomes suspicious and jealous. Wilton brings his friend Morgan home to dinner, and Morgan flatters Bella with evident admiration. At the opera, Wilton receives a note, abruptly excuses himself, and departs. Later, Bella finds the note, which reads: "Dearest, the time has come. I must trust you now to take care of me and the child. Lovingly, Miriam." In mute horror, Bella sinks on the sofa overcome with emotion. She tells Morgan of her suspicions and he proves a sympathetic confidant. Wilton tells Bella he will be out of town several days, but Morgan happens to see him under compromising circumstances and tells Bella, who is furious. Taking advantage of her mood, Morgan succeeds in getting her to elope with him. While Morgan and Bella are at supper in a restaurant, she opens a forgotten letter and learns that her husband is bringing home on the 7:10 train his sister Miriam and her baby. In a flash she realizes her terrible mistake. Morgan tries to detain her, but she jumps into his auto and by a death-defying ride, reaches home before the arrival of the 7:10 train. There Bella greets her husband, he tells her Miriam's story, and she bravely confesses her narrow escape from a terrible fate. With a smile of compassion, he seals his forgiveness with a kiss.