Michael Gough as Edmond Bancroft

June Cunningham as Joan Berkley

Graham Curnow as Rick

Shirley Anne Field as Angela Banks

Geoffrey Keen as Supt. Graham

Gerald Andersen as Dr. Ballan

John Warwick as Insp. Lodge

Beatrice Varley as Aggie

Austin Trevor as Commissioner Wayne

Malou Pantera as Peggy

Howard Greene as Tom Rivers

Dorinda Stevens as Gail Dunlap

Stuart Saunders as Strength-Test Barker

Hilda Barry as Woman in Hall

Nora Gordon as Woman in Hall

Vanda Godsell as Miss Ashton

Gerald Case as Bookshop Manager

Geoffrey Denton as Sergeant at Jail

Sydney Bromley as Neighbour

John Harvey as Man in Bookshop

Carole Ann Ford as Teen in Hall of Mirrors (uncredited)