The film's sets were designed by the art directors Hans Kuhnert and Peter Schlewski.

Commercial Attaché Dr. Otto Dernburg travels to Germany from South America for business negotiations.

But first he visits his younger brother Ralf, who lives in an attic apartment with his friend Charley.

The two are expecting the attractive Swedes Ulla and Britta, but are afraid of their strict uncle Niels.

At first she is very piqued because the wrong aunt is wearing the dress that Dernburg's butler had stolen shortly before.