Paola is the beautiful and jealously guarded younger wife of a shady factory owner, Enrico Fontana. 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.