Dirk Bogarde as Melville Farr

Sylvia Syms as Laura Farr

Dennis Price as Calloway

Anthony Nicholls as Lord Charles Fullbrook

Peter Copley as Paul Mandrake

Norman Bird as Harold Doe

Peter McEnery as Jack Barrett

Donald Churchill as Eddy Stone

Derren Nesbitt as Sandy

John Barrie as Inspector Harris

John Cairney as Bridie

Alan MacNaughtan as Scott Hankin

Nigel Stock as Phip

Frank Pettitt as Barman (as Frank Pettit)

Mavis Villiers as Madge

Charles Lloyd Pack as Henry

Hilton Edwards as P.H.

Margaret Diamond as Miss Benham

David Evans as Mickey

Noel Howlett as Patterson

Alan Howard as Frank

Dawn Beret as Sylvie

Frank Thornton as George - Henry's Assistant (uncredited)

John Bennett as Undercover Detective (uncredited)

Basil Dignam as Barrister (uncredited)

Jim Brady as Transport Cafe Patron (uncredited)

Jack Taylor as Building Site Foreman (uncredited)

Nora Gordon as Farr's Housekeeper (uncredited)