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Popular Dutch moppet singer Heintje appears in his fourth film in this sentimental sob story. Heintje's innocent father Klaus (Heinz Reincke) is wrongly imprisoned on a trumped-up embezzlement charge. The boy goes to live with his maternal grandfather, who is cold, distant and wealthy. He has never forgiven Klaus for eloping with his daughter who died shortly after Heintje's birth. The boy melts the stony heart of the callous grandfather and helps track down the villains who sent his father to jail. Klaus falls in love with his beautiful court-appointed attorney. Heintje sings several songs in the film and is reunited with his estranged father who looks forward to marrying his lawyerly lady-love.