Enrico Rosseni
Herta Rosseni
Elizabeth Seccles (as Christine Galbo)
Inspector Barth
Professor Bascombe
Brenda Pilchard
Solange Beauregard
Mrs. Erickson
Mr. Erickson
Janet Bryant
Helen Edmonds
Enrico's Landlord
Father Webber
Mr. Newton (as Antony Vernon)
Ruth Holden (as Emilia Wolkowich)
Mr. Bryant
Father Herbert
Mr. Leach, the headmaster
Susan, a student
CID Officer reading Newspaper (uncredited)
Woman in Church (uncredited)
Joseph Kane (uncredited)
Man at Church (uncredited)
Phillip Sullivan (voice) (uncredited)
Brenda's Mother (uncredited)
Priest / Policeman (uncredited)
Edgar Wallace (voice) (archive footage) (uncredited)
Policeman (uncredited)