Night Key (1937)

When the head (Samuel S. Hinds) of a major security company buys the revolutionary alarm system of an inventor (Boris Karloff) to keep it off the market, the inventor gets his revenge by rendering the company's alarm system ineffective. This action attracts the attention of a mobster (Alan Baxter) who's the head of a major crime ring. Directed by Lloyd Corrigan, this rather silly blend of science fiction and crime film is fairly entertaining if you don't take it too seriously. It's just the usual B programmer that Universal was grinding out back then. The most interesting aspect of the movie is the relationship between the nearly blind Karloff and a loser of a petty criminal played by Hobart Cavanaugh which ends up being rather touching. As usual, the film is padded out by young lovers whose romantic antics do nothing for the film. In this case, Jean Rogers as Karloff's daughter and Warren Hull as a security guard. With Ward Bond and Frank Reicher.