Irene Wagner, the wife of prominent scientist Albert Wagner, finds herself blackmailed about her affair by her lover's jealous ex-girlfriend. The plot, an experiment in causing fear, drives her into a rage.
Karen, a young woman from the Baltic countries, marries fisherman Antonio to escape from a prisoners camp. But the life in Antonio's village, Stromboli, threatened by the volcano, is a tough one and Karen cannot get used to it.
Paola, a Milan call girl, returns home to her village in an attempt to go straight. Rejected by her father, blackmailed by a former lover, and lusted after by her brother-in-law, she turns to her beloved sister for support.