One of the key factors in Italian unification was the overthrow in 1860 of Francesco, the King of Naples and the two Sicilies, who went into elegant but impoverished exile in Rome with his Queen, Maria Sofia. This seriocomic drama follows the deposed royals as they adapt to their new lives. The former king has recognized the political finality of his deposition, but his queen has taken to traveling in men's clothing all over Italy trying to foment an uprising to restore them to the throne. She is also frantic to have a baby, an heir, but the king has become celibate as a kind of homage to his beloved mother; he spends all his time lobbying the Vatican to get her declared a saint.

In the 1860's, Giorgio (Giraudeau), a young Italian soldier is sent to a remote post, far away from his lover, Clara (Antonelli). He is lodged in the house of the colonel (Girotti). He becames friends with the colonel and the local doctor (Trintignant). Among the inhabitants of the house, there is a strange young woman - Fosca (d'Obici) who is both unattractive and mad. However, she has a passion that Giorgio will have to cope with.