A British diplomat falls in love with a famous singer when he meets her in Cannes.
The members of the Popinot family of French champagne tycoons suspect that the widowed head of the family Charles Popinot is keeping a mistress in Rome and generally living a wild life. Unbeknownst to them he has happily re-married and had a son with a much younger woman. She believes he is twenty years younger than he really is and is shocked when his relatives including his mother, grown-up sons and granddaughter arrive in Italy.
While vacationing in St. Moritz, a British couple receive a clue to an imminent assassination attempt, only to learn that their daughter has been kidnapped to keep them quiet.
A British officer in the Camel Corps in Egypt goes undercover to investigate a gang of drug smugglers. He enlists the aid of a female pilot to help break up the gang.
Sanger, an eccentric expatriate composer, dies in his house in the Austrian Alps, leaving his daughters penniless. The young composer Lewis Dodd, a longstanding friend of the family, falls in love with their cousin Florence when she comes to take the girls back to England. But little Tessa Sanger is in love with Lewis herself, and when she runs away from school and comes to live with Florence and her husband, their already-shaky marriage is further undermined