 In revolution-torn China, American mercenary O Hara is entrusted with a perilous mission, to get arms for the helpless authorities in a province ravaged by warlord General Yang. On the train to Shanghai, he meets Judy Perrie, whose father is in league with Yang. Will Judy regret agreeing to lure O Hara to his doom, and if so, can she make it up to him? The balance of power seesaws to a perilous conclusion.