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Mary Ann (Shirley Mason) is a drudge who works in a London boardinghouse run by Mrs. Leadbatter (Georgia Woodthorpe). One of the boarders is Lancelot (Casson Ferguson), a handsome young composer who has a problem making ends meet, primarily because he refuses to write commercial music. He befriends Mary Ann and slowly they fall in love. A stranger comes skulking around the boarding house, showing an interest in Mary Ann. It turns out that she has inherited a fortune from her brother, and the stranger is hoping to win her love and marry into the inheritance. Lancelot helps chase him off. He has already asked Mary Ann to be his own housekeeper, but her sudden wealth scares him off. Eventually he writes a composition that becomes a success and he and Mary Ann are united.