Well, this is bit strange. Apparently I can buy two books about the life of Graham Greene, both by the same author - Richard Greene. One is called "The Unquiet Englishman: A Life of Graham Greene" (512 pages) published Nov 2020 [1] and the other is called "Russian Roulette: A brilliant new life of Graham Greene" (602 pages) published Sep 2020 [2].

Which one do I buy?

[1] https://www.amazon.co.uk/Unquiet-Englishman-Life-Graham-Gree...

[2] https://www.amazon.co.uk/Russian-Roulette-Times-Graham-Green...