"[-] chastity was worth more than rubies, but the truth was it was priced at a fur coat or thereabouts."
Stamboul Train was written in the early 1930s and social norms have changed somewhat in the past 80 years. Perhaps this explains why I initially found many of the characters in the book unsympathetic; the bullying female journalist, the dancer who felt herself to be under a sexual obligation, the prejudices that were shown by many.
But as the characters interact and the story develops, I started to enjoy it more. About half way through, the Greene that I love came out when the character Dr Czinner reflects on his life and his feelings about duty, religion, revolution and the working class.