Everyone in San Francisco is trying to figure out who stole $3 million in gold from the U.S. Mint, when Jay McGraw walks into a police station with a beautiful Chinese slave girl and an incredible story. The bloodthirsty head of the most powerful tong in Chinatown, Yen Ching, had heisted the gold to smuggle it back to China and hidden it in Jays beer wagon! The slave girl Lee Sing and Jay are the only ones who can recognize Yen Ching, so they join the police in a dangerous chase to get the diabolical leader and the gold . . . before his hatchet men get them.