Recently reading Graham Greene's The Human Factor, its portrayal of Western Intelligence agencies being mired in moral ambiguity and beurocratic confusions was

Recently reading Graham Greene's The Human Factor, its portrayal of Western Intelligence agencies being mired in moral ambiguity and beurocratic confusions was compelling reading. I hear it was even made into a rather successful film. (Spoiler below.) . . . . . . . I wonder how the film or book would be received now, where it shows the protagonist who is an MI6 officer defecting to the USSR at the end of it.