This is a film that could be described as nearly perfect. It is difficult to write much about this film without giving too much away. Director Otto Preminger transplanted the source novel from New York to London. Reportedly that was simply because he preferred working in England, but effect really elevates the film to a masterpiece. The black and white cinematography, much of which was done in real locations, is stunning shot after beautiful shot. Carol Lynley and Keir Dullea play an American brother and sister who are in the process of relocating to London due to his work as a journalist, when, well, the title of the film happens. Laurence Olivier is restrained by excellent as the chief inspector assigned to the case, and Noel Coward is unforgettable as the charming but very creepy landlord of the apartment where the Americans are trying to settle in. The British Invasion band The Zombies appear on a TV in the background of one scene, and turn up later in the soundtrack. This may seem like an attempt to exploit the popular image of Swinging ’60s London, but it also serves as an emotional counterpoint to the panicking mother.
Oh, yeah, and yet another wonderful Saul Bass title sequence.
Well, that is all you are going to hear from me, since this is a thriller and should remain so.