Whoever is responsible for the story that told by this film simply didn't know of a reasonable way to pull it together, and so just let it fall apart.
After an unexplained separation of six years, an American flies to the UK to meet the woman whom he loves, an actress of some fame. As he and the other passengers walk from the plane to a terminal building, a man whom he stops by chance is felled by a sniper's bullet. The sniper walked with the assistance of a crutch. It is discovered that the woman whom the American has come to see had been both sexually involved and engaged in smuggling with the man identified as the victim of the sniper; apparently she was motivated to do these things because of her longing for the American. Further, her lover had subsequently blackmailed her, and now his presumptive widow, a singer, was blackmailing her. On the way, we discover that someone with an administrative rôle at the singer's theater uses a crutch. When the actress attempts to pay the singer, the actress and the audience learn that the presumptive dead man is still alive, and being assisted by his wife. The fellow with the crutch makes an appearance and is greatly injured by the blackmailer. The police, who have been going about the business of trying to solve the murder and trying to run the actress to ground show-up. A search for the blackmailer is begun; he has for no very good reason disguised himself as the fellow with the crutch, and when the police begin looking for a man with a crutch, it does not occur to him to chuck the thing aside; instead, he retreats to a balcony. When he is spotted, the America dashes after him, instead of allowing the surrounding police to do their job. A struggle ensues, with the American finding himself to be pushed off the balcony.
Were the film to break at this point, the audience would be left with many questions. Answering even just some of them in a satisfactory manner would be quite a challenge.
Well, the American awakes, because it was all a dream. That was the best answer that the writers had for us. (Formally, the ending has the disembarked American and the actress happily running each towards the other, perhaps to assure us that he hasn't dreamt exactly the future he were about to enter.) If, up to that point of awakening, the story had been, in some interesting way, dream-like, then that ending might be sensible or at least forgivable. But the story had been a haphazard construction of implausibilities, and the ending was simply a cheat.
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