Pearls Over Shanghai is a comic mock-operetta about white slavery, opium dens, and miscegenation set in the colorful world of 1937 Shanghai. The story is set at the crossroads of good and evil; an exotic “old sin town” filled with singing sailors, humorous whores, foolish immortals, handmaidens and henchmen, all taking their places in streets teeming with a mix of foreign aristocrats, opium addicts, and gangland slave-trade czars.