It is 1935, and Tom Stewart, a young Englishman with a longing for adventure, buys himself a cheap ticket aboard the SS Darjeeling—en route to the complex and corrupt world of Hong Kong. A shipboard wager leads to an unlikely friendship that spans seven decades as Hong Kong endures the savagery of the Japanese occupation, emerging as a crossroads of international finance and the nexus of a world of warlords, drug runners, and Chinese triads.