Captain Sam Vimes, Ankh-Morpork City Guard (Night Watch), sat in the draughty anteroom to the Patrician's audience chamber with his best cloak on and his breastplate polished and his helmet on his knees.

He stared woodenly at the wall.

He ought to be happy, he told himself. And he was. In a way. Definitely. Happy as anything.

He was going to get married in a few days.

He was going to stop being a guard.

He was going to be a gentleman of leisure.

He took off his copper badge and buffed it absent-mindedly on the edge of his cloak. Then he held it up so that the light glinted off the patina'd surface. AMCW No.177. He sometimes wondered how many other guards had had the badge before him.

Well, now someone was going to have it after him.

This is Ankh-Morpork, Citie of One Thousand Surprises (according to the Guild of Merchants' guidebook). What more need be said? A sprawling place, home to a million people, greatest of cities on the Discworld, located on either side of the river Ankh, a waterway so muddy that it looks as if it is flowing upside down.

And visitors say: how does such a big city exist? What keeps it going? Since it's got a river you can chew, where does the drinking water come from? What is, in fact, the basis of its civic economy? How come it, against all probability, works?

Actually, visitors don't often say this. They usually say things like “Which way to the, you know, the… er… you know, the young ladies, right?”

But if they started thinking with their brains for a little while, that's what they'd be thinking.

The Patrician of Ankh-Morpork sat back on his austere chair with the sudden bright smile of a very busy person at the end of a crowded day who's suddenly found in his schedule a reminder saying: 7.00-7.05, Be Cheerful and Relaxed and a People Person.