Diane Cilento as Margo Wendice

Laurence Harvey as Tony Wendice

Hugh O'Brian as Mark Halliday

Cyril Cusack as Chief Insp. Hubbard

Nigel Davenport as Lesgate

Glynn Edwards as Sgt. Edwards

Garry Marsh as Lionel

Joanne Dainton as Barmaid

Michael Gaunt as Det. Sgt. Williams

Arthur Hewlett as Hotel Clerk

Carole Ann Ford as