Thomas Perry has never reached the popularity of many "revenge" writers (including Shakespeare), but his "Butcher's Boy" (and its successor, "Sleeping Dogs"), is a true classic, the Bard nothwithstanding. What happens if you're a very good hired killer and the Mob doesn't pay you out after your flawlessly executed last job? You let the devil loose between the pigeons. Yes the guy is amoral - thou shall not kill and all that - but he has a brutal code of honour, and you can't help cheering for him. I wonder if Carol O'Connell, with her Mallory novels, didn't pinch at least a little of Perry's flavour! Oh, and don't forget his Jane Whitefield novels either.