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.
In 18th-Century Russia, the Czar, Paul, is surrounded by murderous plots and trusts only Count Pahlen. Pahlen wishes to protect his friend, the mad king, but because of the horror of the king's acts, he feels that he must remove him from the throne.