After a serial killer strangles several women with a necktie, London police identify a suspect—but he claims vehemently to be the wrong man.
Jon Finch
as Richard Ian Blaney
Barry Foster
as Robert Rusk
Barbara Leigh-Hunt
as Brenda Margaret Blaney
Anna Massey
as Barbara Jane 'Babs' Milligan
Alec McCowen
as Chief Inspector Tim Oxford
Vivien Merchant
as Mrs. Oxford
Billie Whitelaw
as Hetty Porter
Clive Swift
as Johnny Porter
Bernard Cribbins
as Felix Forsythe
Michael Bates
as Sergeant Spearman
Jean Marsh
as Monica Barling
Elsie Randolph
as Gladys
