John Saxon as Dr. Marcello Bassi

Letícia Román as Nora Davis

Valentina Cortese as Laura Craven-Torrani

Dante DiPaolo as Andrea Landini

Titti Tomaino as Inspector

Luigi Bonos as Albergo Stelletta

Milo Quesada as De Vico / Paccini

Gustavo De Nardo as Dr. Facchetti

Giovanni Di Benedetto as Professor Torrani

Jim Dolen as Priest (uncredited)

Franco Ressel as Arresting Officer at Airport (uncredited)

Robert Buchanan as Dr Alessi

Marta Melocco as Murder Victim

Lucia Modugno as Nurse

Franco Moruzzi as Policeman

Virginia Doro as Torrani's Maid

Mario Bava as Uncle Augusto

Chana Coubert as Ethel Windell Batocci

Adriana Facchetti as Woman in Sguattera Restaurant

Dafydd Havard as

Tiberio Murgia as

Peggy Nathan as

Lido Pini as

John Stacy as