一名连环杀手用领带勒杀女性，伦敦警方锁定了嫌疑人，却错抓无辜，真凶仍在城市中游荡。
Jon Finch
Richard Ian "Dick" Blaney
Barry Foster
Robert "Bob" Rusk
Barbara Leigh-Hunt
Brenda Margaret Blaney
Anna Massey
Barbara Jane "Babs" Milligan
Alec McCowen
DCI Tim Oxford
Vivien Merchant
Mrs Oxford
Billie Whitelaw
Hetty Porter
Clive Swift
Johnny Porter
Bernard Cribbins
Felix Forsythe
Michael Bates
DS Spearman
Jean Marsh
Monica Barling
John Boxer
Sir George
Madge Ryan
Mrs Davison
George Tovey
Neville Salt
