Det. Charlie Chan (Warner Oland) travels to the 1936 Berlin Olympics, where he is on the case to track down a team of international spies and recover their secret weapon, which is capable of controlling flying aircraft. Villains are everywhere and lead Chan, local cops and Chan's son, Lee (Keye Luke), on a chase through the streets of Berlin. Actual footage of the Olympic games and the doomed dirigible &NFi;Hindenburg&NFi_; are woven into the story.