Murders and red herrings proliferate in this whodunit about a maniac at large in Rome. David Hemmings, Daria Nicolodi. Carlo: Gabriele Lavia. Marta: Clara Calamai. Helga: Macha Meril. Giordani: Glauco Mauri. Calcabrini: Eros Pagni. Amanda: Giuliana Calandra. Directed by Dario Argento.