And it's important to remember that the creatures of the night aren't simply the people of the day staying up late because they think that makes them cool and interesting. It takes a lot more than heavy mascara and a pale complexion to cross the divide.
Heredity can help, of course.
The raven had grown up in the forever‑crumbling, ivy‑clad Tower of Art, overlooking Unseen University in far Ankh‑Morpork. Ravens are naturally intelligent birds, and magical leakage, which has a tendency to exaggerate things, had done the rest.
It didn't have a name. Animals don't normally bother with them.
The wizard who thought he owned him called him Quoth, but that was only because he didn't have a sense of humour and, like most people without a sense of humour, prided himself on the sense of humour he hadn't, in fact, got.
The raven flew back to the wizard's house, skimmed in through the open window, and took up his roost on the skull.
" Poor kid," he said.
" That's destiny for you," said the skull.
" I don't blame her for trying to be normal. Considering."
" Yes," said the skull. "Quit while you're a head, that's what I say."
The owner of a grain silo in Ankh‑Morpork was having a bit of a crackdown. The Death of Rats could hear the distant yapping of the terriers. It was going to be a busy night.
It would be too hard to describe the Death of Rats' thought-processes, or even be certain that he had any. He had a feeling that he shouldn't have involved the raven, but humans set a great store by words.
Rats don't think very far ahead, except in general terms. In general terms, he was very, very worried. He hadn't expected education.
Susan got through the next morning without having to go nonexistent. Geography consisted of the flora of the Sto Plains, chief exports of the Sto Plains and the fauna of the Sto Plains. Once you mastered the common denominator, it was straightforward. The gels had to colour in a map. This involved a lot of green. Lunch was Dead Man's Fingers and Eyeball Pudding, a healthy ballast for the afternoon's occupation, which was Sport.
This was the province of Iron Lily, who was rumoured to shave and lift weights with her teeth, and whose shouts of encouragement as she thundered up and down the touchline tended towards the nature of 'Get some ball, you bunch of soft nellies!"
Miss Butts and Miss Delcross kept their windows closed on games afternoon. Miss Butts ferociously read logic and Miss Delcross, in her idea of a toga, practised eurhythmics in the gym.
Susan surprised people by being good at sport. Some sport, anyway. Hockey, lacrosse and rounders, certainly. Any game that involved putting a stick of some sort in her hands and asking her to swing it, definitely. The sight of Susan advancing towards goal with a calculating look made any goalie lose all faith in her protective padding and throw herself flat as the ball flashed past at waist height, making a humming noise.
It was only evidence of the general stupidity of the rest of humanity, Susan considered, that although she was manifestly one of the best players in the school she never got picked for teams. Even fat girls with spots got picked before her. It was so infuriatingly unreasonable, and she could never understand why.
She'd explained to other girls how good she was, and demonstrated her skill, and pointed out just how stupid they were in not picking her. For some exasperating reason it didn't seem to have any effect.
This afternoon she went for an official walk instead. This was an acceptable alternative, provided girls went in company. Usually they went into town and bought stale fish and chips from an unfragrant shop in Three Roses Alley; fried food was considered unhealthy by Miss Butts, and therefore bought out of school at every opportunity.
Girls had to walk in groups of three or more. Peril, in Miss Butts's conjectural experience, couldn't happen to units of more than two.
In any case it was certainly unlikely to happen to any group that contained Princess Jade and Gloria Thogsdaughter.
The school's owners had been a bit bothered about taking a troll, but Jade's father was king of an entire mountain and it always looked good to have royalty on the roll. And besides, Miss Butts had remarked to Miss Delcross, it's our