Charlie Chan at the Olympics

... that being that the film is set at the 1936 Olympics in Berlin.

A plane is doing a test flight with a brand new invention vital to the defense of the United States when the plane disappears. The audience can see inside the cockpit that someone hiding inside the plane overpowers the actual pilot, but the cast is denied this knowledge. Charlie Chan finds the plane with the body of the pilot nearby while on a fishing trip with one of his younger sons. A careful investigation leads suspicions to somebody who is part of the American Olympic team, and thus he has left Hawaii for Berlin. Therefore Chan goes to Berlin himself to continue the investigation. A further complcation is that oldest Chan son Lee is a competitor in the games there.

Set in 1936, there is quite a bit of stock footage of the 1936 Olympic games. There is one shot with the torch bearer running down the stairs with people in the crowd on either side of him clearly performing the Nazi salute. The Berlin police are portrayed as pedantic stumble bums whose hearts are in the right place and who act and dress like the Kaiser is still alive versus the rather lethal group that they had become by 1936 - not a group you'd want to tangle with.

What is really ironic is that Charlie postulates that the radio control device will be sold in Germany to some unnamed group of international terrorists because they feel "safe" in Germany during the games because of the presence of so many people from many nations. It's so interesting to see how the United States and the rest of the world did not take Hitler's Germany seriously until it was almost too late.