Special Agent K-7 (1937)

Special Agent K-7 is Vince Landers (Walter McGrail) of the FBI who is ready to retire after a long career fighting crime (we won't make any cereal jokes). He is persuaded to investigate why the trial of a gangster has collapsed. He ends up investigating a series of murders including some of the jurors and some characters in a club.

A complication in his investigation is that one of Landers ex-s Olive (Queenie Smith) is involved in the case. Her new husband Bill (Donald Reed) ends up being one of the suspects.

The film has a decent plot and the low budget doesn't detract from it. It is a serviceable B-movie. At times a bit murky but the club setting is enjoyable. The film also has some interesting forensic science.