Two circus performers are tasked with escorting relief in the form of gold bullion to a region hit by drought. On the way they are beset by countless bandits.
After getting in trouble with local gangs, a young man (Fu Sheng) flees to San Francisco, where the same gangs are still causing problems.
Bulldog Drummond is injured when his sabotaged car crashes and Jack Pennington agrees to masquerade as the sleuth.
Bulldog Drummond goes up against foreign agents trying to steal plans for a top-secret aircraft.
