A demented nun sliding through morphine addiction into madness, while presiding over a regime of lesbianism, torture and death. Sister Gertrude is the head nurse/nun in a general hospital, whose increasingly psychotic behavior endangers the staff and patients around her.
The son of an ailing nobleman returns to France to clear his name and prove where the true guilt lies.
Leo (Vittorio De Sica) is young man trying to make a living without any success. Through fortuitous circumstances, he is assigned by the director of a big firm to accompany for one night the daughter of the firm's accountant, Titi (María Mercader). Leo pretends then to be the son of a tycoon, and takes her in a luxurious restaurant.
