Ignazio Panizza goes from one failure to the other until he meets a singer, Caterina, provided with an exceptional voice.

Sophia Loren plays a dual role, as both the sultry Queen of the Nile with a "man-a-night" appetite and a beautiful slave girl who takes her place and is wooed by a bodyguard who thinks she's the real monarch.

During a police raid at Villa Borghese, the agent, a widower named Antonio Caccavallo, stays to get better acquainted with the young Carolina.