Other notable works by Graham Greene include Our Man in Havana (1958), the End of the Affair (1951), the Comedians (1966), and the Third Man (1949). The definitive biography is Norman Sherry's The Life of Graham Greene (1989).
For further reading in the category of the "moral thriller": look for works by Alan Furst, John Le Carre, Patricia Highsmith, and pretty much every other crime writer of the last half of the twentieth century. In addition, Greene wrote his own screenplay for The Third Man (1949), and his work heavily influenced the Orson Welles film A Touch of Evil (1958).
The Heart of the Matter was voted as one of the top one hundred novels of the 20th century. What does this...