A plane designer is murdered, the question is: have his secret aeroplane plans also been stolen? Philo Vance (James Stephenson) is called upon to investigate. Now, the murder took place in a locked room (so this has both a Golden Age style locked room mystery and an espionage plot!) Of course there are a lot of potential suspects, and the various Axis powers are involved...
Although this is largely a remake of the earlier Philo Vance film the Kennel Murder Case, it has been nicely updated to reflect the geopolitical situation of the time. However, the film - although still perfectly good - is not quite as good as the original which was one of the best Philo Vance movies. The locked room mystery is a good one and nicely worked out.
