The down-and-out private detectives Rudi and Moritz join Karin and Gerda on the hunt for an inheritance million. According to the testator's will - Aunt Trude from Buxtehude - the money must be received by Gerda within a week.

Andy is mistaken for Eva at the girls' boarding school and treated sternly by principal Schatz but loved by his co-eds. To get Andy out of 'her' skirt Andy's pal Rudi has to dress up as Eva's mom to convince Schatz to release 'her'.