Farley Granger as Inspector Capuana

Sylva Koscina as Barbara Capuana

Silvano Tranquilli as Paolo Santangeli

Annabella Incontrera as Franca Santangeli

Chris Avram as Professor Casali

Sandro Pizzochero as Roberto

Krista Nell as Renata

Angela Covello as Bettina Santangeli

Fabrizio Moresco as Piero

Andrea Scotti as Gianni

Irene Pollmer as Giannina

Luciano Rossi as Gastone

Ivano Staccioli as The Liar

Nino Foti as

Jessica Dublin as Rossella

Paul Oxon as Mauro

Philippe Hersent as The Questor

Nieves Navarro as Lilly

Femi Benussi as Serena

Bruno Boschetti as Policeman

Benito Stefanelli as Lilly's husband

Luigi Ciavarro as

Milla Johansson as The first victim (uncredited)