A Philo Vance story with Noir-ish elements (i.e. people get bumped off at regular intervals). An emerald has been stolen but before the fence (Dan Seymour) can double cross his syndicate of backers and his mistress he is bumped off.
Unfortunately for Philo Vance (played by Alan Curtis this time) he is present due to an association with Laurien March (Vivian Austin) and thus the police include him as a suspect.
Vance conducts his own investigation assisted/hindered by his rather dopey detective Ernie (Frank Jenks) who provides a bit of comic relief. The film is fast paced with some decent lines and nicely dark in the right areas. The ending also has a really nice twist.