London based US reporter Michael (George Murphy) delays his holiday to Paris to look in on a strange case of an umbrella wielding criminal who has apparently done away with someone. A policeman is also shot by the mysterious man.
While taking a look, with his trusty dog (Corky), and after chasing a man with a brolly, Michael encounters Patricia (Rita Johnson) the daughter of a rich businessman (Montague Love). Somehow the businessman's house, or someone from the household in any event, is involved in the Umbrella Man case and Michael wants to court Patricia in any case. With the help of Inspector Jefferson (George Zucco), though shouldn't that be the other way around, Michael tracks down the mysterious Umbrella Man who is employing all number of tricks to stay ahead of the law...
A fine crime drama with plenty of twists and turns. London is eternally foggy and dark though that helps with the sinister atmosphere of course. The accents can be quite something, but not in a good way. The villain is very good and the crimes are inventive. Though the ending of the film is somewhat rushed.