A killer is cleaning up the streets of Milan by murdering those considered as deviant. An ornamental dragonfly, soaked in the blood of the victim, is left on each body.
Paul Naschy
as Inspector Scaporella
María Kosty
as Ingrid
Erika Blanc
as Silvana Scaporella
Ángel Aranda
as Pietro Volpini
Ricardo Merino
as Edmundo
Susana Mayo
as Claudia Volpini
Eduardo Calvo
as Professor Sandro Campitelli
Mariano Vidal Molina
as Police Commissioner
José Canalejas
as Ruggero
María Vidal
as Lucia - Prostitute victim
Ingrid Rabel
as Giulia - Secretary
Frances O'Flynn
as Marie - scrubwoman
