Engineer Jake Holman arrives aboard the gunboat USS San Pablo, assigned to patrol a tributary of the Yangtze in the middle of exploited and revolution-torn 1926 China. His iconoclasm and cynical nature soon clash with the ‘rice-bowl’ system which runs the ship and the uneasy symbiosis between Chinese and foreigner on the river. Hostility towards the gunboat’s presence reaches a climax when the boat must crash through a river-boom and rescue missionaries upriver at China Light Mission.

Archie Lee Meighan is a failing cotton gin owner who is married to Baby Doll, a 19-year old childlike beauty whose father arranged the marriage for financial reasons. As Archie awaits the arrival of Baby Doll’s 20th birthday, the day that they are supposed to consummate their marriage, he faces interference from business rival Silva Vacarro, who plots to seduce Baby Doll away from Meighan.