During one unusually hot weekend, four friends struggle after hearing some life-changing news.

The episodic story of a composer of operettas, Rudi Kleiber, in in old Viennese days, and the two women in his life; Maria Zeitler, his sweetheart, later mistress, lost love, an operetta star, and his first patron, and the mother of a son he did not know he had; and of Greta, his first love and companion in later years