Year 1763. Forced into exile, the famous libertine Giacomo Casanova leaves Paris and travels to London, where he meets Marianne de Charpillon, a young prostitute to whom he is so attracted that he forgets about the other women.

Under the pressure of his boss, a music producer decides to set up a group consisting of a rabbi, a priest and an imam to make them sing the living together. But the religious he recruits are far from being saints ...