To solve the murder of a man shot in a locked room, Chan must wade through a Fun House, the writings of an unscrupulous author, and chess pieces.

Charlie Chan is an agent of the US government working in Washington DC and he is assigned to investigate the murder of the inventor of a highly advanced torpedo. Aiding Chan is his overeager but dull-witted son Tommy and his daughter Iris.

Chinese sleuth Charlie Chan (Sidney Toler) discovers a scheme for the theft of government radar plans while investigating several murders.

Chinese detective Charlie Chan (Sidney Toler) solves a murder linked to the occult. This movie had an alternative title: Meeting at Midnight.

The latest assignment for respected detective Charlie Chan has come directly from the government and involves the disappearance of a scientist named Harper, who was working on an extremely important serum. When the scientist is killed, Chan must sort through all very likely suspects, including the man's sister and his butler.