Billy Wilder directs this romantic comedy set in Paris starring Jack Lemmon and Shirley MacLaine. Bumbling police office Nestor (Lemmon) is struck off the force after raiding a brothel which his superiors frequent. When he revisits the place of his downfall he steps in to protect popular prostitute Irma (MacLaine) from her pimp and ultimately finds himself fulfilling the role. As he begins to fall in love with her Nestor does all he can to stop her seeing other clients so he invents a fictitious British Lord to become her sole client. However, things become complicated when Irma falls for Nestor’s alter ego and he is forced to take drastic action in order to have Irma all to himself.