When Nobby had gone Vimes reached behind the desk and picked up a faded copy of Twurp’s Peerage or, as he personally thought of it, the guide to the criminal classes. You wouldn’t find slum-dwellers in these pages, but you would find their landlords. And, while it was regarded as pretty good evidence of criminality to be living in a slum, for some reason owning a whole street of them merely got you invited to the very best social occasions.