I have read through Part 1 now so almost 1/3 through the book. It reads quickly. He is now at the gateway to entering Liberia.
I did some research on Graham Greene today. Wikipedia has a detailed article. I was surprised to read that Kim Philby was his friend and supervisor at MI6. Of course I recognized that name from the Cambridge Spy Ring, which the Literary Club read a fictionalized account of in
The Untouchable by John Banville.
Greene was a very cinematic author. Wikipedia says IMDB lists 66 titles between 1934 and 2010 based on his works. I thought it was funny when he talks almost in embarrassment in
A Journey Without Maps about seeing a movie poster based on his work along the route from England to Africa.
I was surprised to read of the number of places that he traveled to and wrote about in his nonfiction works such as Mexico, West Africa, Vietnam, Cuba, Haiti, and Argentina. It's not surprising that these people and places would provide inspiration in his fiction works. However, there is a term in the Oxford dictionary called "Greeneland" defined as "The seedy, politically unstable, and dangerous world said to be the typical setting in the novels of Graham Greene" (origin 1940s).
He won the Jerusalem Prize in 1981, which is "a biennial literary award given to writers whose works have dealt with themes of human freedom in society." I was unfamiliar with this award, but the list of past winners is very interesting.
https://en.wikipedia.org/wiki/Jerusalem_Prize