Landing at a Chinese port, tough sea captain Bucklin and his passengers are threatened by a marauding war lord, who intends to kill the captain and hold the others hostage as part of his campaign of destruction against all white men.

Saxophone player Clyde meets a woman named Flowers, and teaches her to dance. He later discovers that gangster boss "Blackjack" is also in love with her. "Blackjack" is also battling gang boss Mike Luego in a violent turf war.

Joan Fry, a society woman, falls in love with Chuck Riley, the white leader of a powerful gang in Chinatown, and he quickly drags her down into the depths with him. But seeing her so much in love with him causes him to realize he is in love with her, and he determines to lift her up again. "Boston" Charley, the rival gang-leader, has other plans.

Capt. Robert Kelly holds off the foreign mob single-handed and makes good his escape during the Boxer rebellion.