The captain and the enemy

A young boy, Victor, is collected from school by a stranger in a bowler hat - the stranger says he has won Victor in a game of backgammon with Victor's father. The stranger, known as the Captain, takes Victor to live with the sweet but withdrawn Lisa, where he serves as her conduit to the outside world. From mysterious beginnings, Graham Greene's final novel becomes a twisting thriller of smuggling, jewel theft and international espionage which culminates in a dramatic showdown in Panama.