Graham Greene, 1948. Scobie in colonial Sierra Leone — moral compromise to the breaking point.
From Wikipedia
The Heart of the Matter (1948) is a novel by English author Graham Greene. The book details a life-changing moral crisis for Henry Scobie. Greene, a former British intelligence officer in Freetown, British Sierra Leone, drew on his experience there. Although Freetown is not mentioned in the novel, Greene confirms the location in his 1980 memoir, Ways of Escape.