Mary and John Emerson have been married for 22 years, and she treats him more like a son than a husband. Stung by her rebuffs, he succumbs to the youthful charms of Gloria Sanderson, whom he meets on a business trip. But just after he mails a letter to Mary telling her that he will not return, John finds Gloria in her fiancé's arms. Realizing his foolishness, he races to the train to retrieve the letter. He fails, and Mary receives and reads the letter; but she too has seen her error, conceals her knowledge of the letter's contents, and accepts John's professions of love.