Diane Cilento
— Margo Wendice
Laurence Harvey
— Tony Wendice
Hugh O'Brian
— Mark Halliday
Cyril Cusack
— Chief Insp. Hubbard
Nigel Davenport
— Lesgate
Glynn Edwards
— Sgt. Edwards
Garry Marsh
— Lionel
Joanne Dainton
— Barmaid
Arthur Hewlett
— Hotel Clerk
Carole Ann Ford
Michael Gaunt
— Det. Sgt. Williams