Roberto Maldi, a young scientist, is trying to find a serum capable of giving courage but he unwittingly invents a serum which transforms any man in a womanizer. His boss scents a good business and wants to produce the serum on industrial basis, but Roberto does not agree.

The life and loves of great composer Giuseppe Verdi are played against a background of the great operas of the 19th Century. A tender love story of his successful and turbulent life, with more than 20 excerpts from his acclaimed operas.

In 1951, two years after the “scandal” of the Fiamma che non si spegne, Cottafavi got the opportunity to work on a film with a small production company, Novissima Film. With little means, a number of technical and financial problems and working Sundays with the pieces of film given to him bit by bit, Cottafavi shot Una donna ha ucciso, a minor film that marked his comeback to directing. (Gianni Rondolino)

Paola (Lucia Bose) is the beautiful and jealously-guarded younger wife of a shady factory owner, Enrico Fontana (Massimo Girotti). In order to investigate her romantic history he hires a private detective, which ironically brings Paola back into contact with former lover Guido, with whom she resurrects a lost passion. Dogged by the suspicions of their respective mates, they are drawn closer to each other in the face of adversity, and begin to plot Enrico's demise. But when the challenge of being together falls away, will the passion start to wane? A masterpiece of intensity and finely-wrought emotion.