This month brings us back to Tansy Rayner Roberts’ essays about the men of Terry Pratchett’s Discworld, and we are finally looking at Sam Vibes - one of my very favourite characters. How do you take a man who’s a functioning drunk (he’s not rich enough to be an alcoholic), who believes in his job but can’t do it properly and has little else to live for - and then turn him into a fascinating, human and humane character whose development is worth following? You need to be Terry Pratchett, I think.