The successful Austrian pop composer Alexander Marhold is turning fifty and is about to get engaged to his young secretary Heidi, although he is still married to his third wife Beate. Without his knowledge, the Austrian Foreign Ministry invited his two sons from his first and second marriage to Vienna. His first wife married an influential Russian politician and his second wife an American millionaire. The government now wants to use this combination for economic policy purposes. Marhold is not enthusiastic about it, but it bothers him even more that his two grown sons, as different as they are, fall in love with his attractive wife Beate .