Amid Japan's invasion of China during World War II, Jamie "Jim" Graham is a British upper middle class schoolboy enjoying a privileged life in the Shanghai International Settlement. After the attack on Pearl Harbor, Japan begins occupying the settlement. As the Graham family evacuate the city, Jamie is separated from his parents in the ensuing chaos. Jamie makes his way back to their house, assuming they will return. After a length of time alone and having eaten the little remaining food, he ventures back into the city.

Hungry, Jamie tries surrendering to Japanese soldiers, who ignore him. After being chased by a street urchin, he is taken in by two American expatriates and hustlers, Basie and Frank. Unable to sell Jamie for money, they intend to abandon him in the streets, but Jamie offers to lead them to his neighbourhood to loot the empty houses there. Jamie is surprised to see lights on in his family home and thinks his parents have returned, only to discover it is occupied by Japanese troops. The trio are taken prisoner, transported to the Lunghua Civilian Assembly Centre in Shanghai for processing, and ultimately sent to an internment camp in Suzhou.