Jon Finch plays a down-on-his-luck chap, who becomes ensnared in the London police hunt for the 'neck tie' murderer, when his own ex-wife becomes a victim.

Determined to prove his innocence, he goes on the run but additional murders make his situation even worse.

Finch seeks refuge with pal Barry Foster but finds himself thrown into jail. He soon discovers who the real serial killer is but first, must break out of jail to clear his name.

Received four Golden Globe nominations, including Best Picture, Best Director and Best Screenplay.

Henry Mancini was originally hired to score the film but Hitchcock was displeased with his work and had him fired.

During the filming, Alma Hitchcock suffered a stroke and had to be flown back to the U.S.

Covent Garden (produce market) was demolished shortly after film was completed.