The Scarlet Clue (1945)

A decent edition in the Charlie Chan series. Secret radar plans are under threat of being stolen by enemy agents, but when the suspect of Charlie Chan (Sidney Toler) is found dead evidence points to the radio station which shares buildings with the radar laboratory. Someone at the radio station is an agent and we soon find out that Ralph Brett (I. Stanford Jolly) is taking orders from his mysterious controller. Even Brett doesn't know who the controller is as they send their orders via teletype.

As the investigation continues so does the body count. The controller has a number of fiendish ways to kill including a killer elevator and microwave activated poison gas! Finally Chan, assisted by Number 3 Son (Benson Fong) and Birmingham Brown (Mantan Moreland), track down the controller. Though more by process of elimination more than anything else.

An interesting film with a fast moving plot and featuring a number of hi-tech (for the time) gimmicks. Not a bad film by any means, not the best Charlie Chan film but far from the worst either.