I think it is interesting that each of the book clubs has read 3 very different styles of Greene books. I have read them all and enjoyed them all.
Our Man in Havana was read by the old MR Book Club in 2015. Fictional spy book and somewhat humorous.
Journey Without Maps was read by the Literary Club in 2019. Nonfiction travelogue.
The End of the Affair is dramatic fiction from his Catholic novels.