5 Millionen suchen einen Erben (Five Millions Seek an Heir) is a comedy film starring Heinz Rühmann as a vacuum cleaner salesman who must prove he's happily married to inherit $5 million from his American uncle, leading to comical mix-ups with his look-alike cousin, involving a secret agent, fake wives (Mabel), and the real wife (Hix), all culminating in the couple's genuine affection securing the fortune.