Mr. Ducormier, a professor of the violin, is married to an extremely jealous woman. He flirts with Miss Lucette, one of his pupils, and Mrs. Ducormier, thinking that the lessons are too numerous, suspects her husband. One day she finds a letter from Lucette that Mr. Ducormier had forgotten, in the violin case. Naturally, she doubts him no more. Lucette, believing that Mrs. Ducormier is suspicious, disguises her servant as her father, and as an old invalid. Mrs. Ducormier calls on Lucette and is assured that she is mistaken, but the servant, thinking that he is not paid well enough for his services, writes an anonymous letter, and even calls on her and explains everything to her. Without losing any time, Mrs. Ducormier goes to Lucette and finds her husband, who in the absence of the servant, and hearing that his wife is here waiting to be admitted, disguises himself as the old invalid. But all in vain, he is recognized. Luckily Mrs. Ducormier is fond of jewelry and consents to forgive and forget everything when her husband presents her with a beautiful bit of jewelry. They return home and Mr. Ducormier promises to be good for ever more.