Hogfather - Die

“I wonder,” said Teatime, “is it possible to kill Death? This must be a very special sword and it certainly works here…” He raised a hand to his mouth for a moment and gave a little chuckle. “And of course it might well not be regarded as murder. Possibly it is a civic act. It would be, as they say, The Big One. Stand up, sir. You may have some personal knowledge about your vulnerability but I’m pretty certain that Susan here would quite definitely die, so I’d rather you didn’t try any last-minute stuff.”

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Hogfather - p349