Having studied a Graham Greene novel at 'A' level (The Power and The Glory), I've always had a fascination with his work, not that I have read that many (5 or 6 novels perhaps).
Joining a book club years ago, I was able to pick-up a hardback copy of A Burnt-Out Case for next-to-nothing (we're probably talking 1981) and have read it through a couple of times, although some of the details escape me and demand another reading.
Querry is the hero - or antihero, perhaps - and his spiritual & moral condition is likened to that of a leper in whom the disease has burnt-out. As ever, Greene shows a deep awareness of human sin and brokenness but, perhaps, less of a sure grasp of the possibilities of redemption. You never leave one of his novels rejoicing but you sense a possibility for hope, albeit often dimly perceived.
But a very worthwhile read, none the less.