When the bank clerk Klaus Helwig is arrested on suspicion of embezzlement, his son Heintje, whose mother died at birth, comes to his grumpy grandfather's house. Heintje manages to win his heart and prove his father's innocence..
| Actor | Role |
|---|---|
 Heintje SimonsHeintje | Heintje |
 Heinz ReinckeKlaus Helwig | Klaus Helwig |
 Gerlinde LockerRenate Ahrens | Renate Ahrens |
 Paul DahlkeFriedrich Wilhelm Berthold | Friedrich Wilhelm Berthold |
 Helmut FörnbacherRobert Engelhardt | Robert Engelhardt |
 Christiane RückerRoberts Freundin | Roberts Freundin |
 Jan HendriksWilli | Willi |
 Agnes WindeckMrs. von Schleinitz | Mrs. von Schleinitz |
 Martin JenteQuintus | Quintus |
 Rudolf SchündlerSchiller | Schiller |
 Ralf WolterMan on Fair | Man on Fair |
 Friedrich SchoenfelderComissioner | Comissioner |
 Willi RoseGärtner | Gärtner |
 Robert MeynEngelhardt | Engelhardt |
| DDieter KursaweNot listed | Not listed |
 Rolf MoebiusBankangestellter | Bankangestellter |