Dr. Spencer's wife becomes intensely jealous when she finds, in her husband's coat, a note signed "Mary," which asks him to visit the writer at the Hotel Mum. The woman carries her tale of woe to Attorney Thomas, a family friend. In his effort to make light of the matter, Thomas soothingly places his arm about Mrs. Spencer's shoulder. Dr. Spencer's office is directly across the court. Glancing out of the window, the doctor sees his wife apparently being embraced by Thomas. The attorney consents to accompany Mrs. Spencer to the Mum and meet "Mary." The doctor trails the two. As luck would have it, Mrs. Thomas passes the Mum just as her husband and Mrs. Spencer enter. The doctor and Mrs. Thomas meet and make their way after their other halves, on vengeance bent. A stiff punch in the eye informs Thomas that Dr. Spencer feels peeved. At the same time, the two wives engage in a hair-pulling match. The noise of the free-for-all brings Jinny, the Spencer's colored cook, and her friend, the hotel cook, to the scene. The combatants are separated. Jinny, catching sight of the note that had caused the trouble, declares it to be her property. She had received it while mending the doctor's coat. The sudden entrance of her mistress caused the cook to hide it in one of the pockets of the garment. The "Mary" signed at the bottom of the missive is none other than the hotel cook, who had invited Jinny to visit her. Satisfied to call their fight a draw, the husbands shake hands. While her husband destroys the note that was the cause of it all, Mrs. Spencer tearfully vows to curb her jealousy in the future.