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Sein Liebeslied (His Love Song) was evidently intended as a follow-up to the popular filmed operetta Zwei Herzen, utilizing most of the talent (on both sides of the camera) from the earlier picture. Fee Malten stars as Mady Smith, a boarding-school girl who has been so sheltered from the Outside World that she has never even met her parents. During her first foray outside the walls of the school, Mady falls madly in love with the voice of a famous jazz singer. She meets young Jimmy Bolt (Willy Forst), who hopes to score points by pretending to be the idolized singer. What neither Mady nor Jimmy suspect is that the mysterious vocalist is none other than Mady's own father, Maxim Merblanc (Paul Otto).