A young opera singer is stalked by a deranged fan bent on killing the people associated with her to claim her for himself.
Betty
Marco
Inspector Alan Santini
Mira
Giulia
Marion
Stefano
Signora Albertini
Baddini (as Antonio Juorio)
Alma's mother
Mara Czekova's assistant
Cop #2
Lady Macbeth (soprano) (singing voice)
Macbeth (bass) (singing voice)
Narrator (Italian version) (voice) (uncredited)
Betty
Marco
Inspector Alan Santini
Mira
Giulia
Marion
Stefano
Signora Albertini
Baddini (as Antonio Juorio)
Alma's mother
Mara Czekova's assistant
Cop #2
Lady Macbeth (soprano) (singing voice)
Macbeth (bass) (singing voice)
Narrator (Italian version) (voice) (uncredited)
