According to the last will of a deceased millionaire, her brother Severin Petermann and her two nephews Walther von Peterjahn and Johannes Petermann should only be entitled to inherit if they spend a summer together under one roof in an Austrian villa.
| Actor | Role |
|---|---|
 Rudolf PrackJohannes Petermann | Johannes Petermann |
 Paul HörbigerSeverin Petermann | Severin Petermann |
 Gunther PhilippWalther von Peterjahn | Walther von Peterjahn |
| IIlonka RaschBinchen | Binchen |
 Waltraut HaasStefanie Wendt | Stefanie Wendt |
 Peter KrausJerry Fink | Jerry Fink |
| SSepp LöwingerPostman | Postman |