The Mystery of Mr. X

Robert Montgomery is a gentleman jewel thief and in the films of the 1930s this would make him the hero...of sorts. However, his career is in jeopardy due to a serial killer named 'Mr. X'. You see, X has been killing and taunting police for some time and when one of Montgomery's burglaries happens to occur at the same place a copper is killed by X, the police now suspect that X and the gentleman thief are one in the same--which clearly are not. So, it's up to Montgomery to do what he can to help the police capture X--then, and only then, can they possibly sell the huge diamond. Things get complicated when the daughter of the police inspector on the case falls for Montgomery. By the end of the film, it's a life and death struggle between X and Montgomery--and guess who wins! In many ways, this film plays a lot like a Saint or Falcon outing, though with a higher quality budget. The overall product is enjoyable light entertainment--the sort they really haven't made in over 60 years.

By the way, couldn't you also see William Powell in the role Montgomery played? They both seemed to have a real knack for these sort of parts.