For members of the City Watch, life consists of troubling times, linked together by periods of torpid inactivity. Now is one such troubling time. People are being murdered, but there's no trace of anything alive having been at the crime scene. Is there ever a circumstance in which you can blame the weapon not the murderer? Such philosophical questions are not the usual domain of the city's police, but they're going to have to start learning fast.

Throughout history, there's always been a perfectly good reason to start a war. Never more so if it is over a "strategic" piece of old rock in the middle of nowhere. It is, after all, every citizen's right to bear arms to defend what they consider to be their own. Even if it isn't. And in such pressing circumstances, you really shouldn't let small details like the absence of an army get in the way of a righteous fight with all the attendant benefits of out-and-out nationalism.

An aura of mean-minded resentfulness is thick in the streets of Ankh-Morpork. Insurrection is in the air. The Haves and Have-Nots are about to fall out all over again. The Have-Nots want some of their own magic. But magic in the hands of amateurs is a dangerous thing. The City Watch is the last line of defence against such unnatural goings-on. But when even the Watch have trouble telling right from wrong, you know that law and order ain't what they used to be. But that's all about to change.

Commander Sam Vimes of the Ankh-Morpork City Watch had it all. But now he's back in his own rough, tough past without even the clothes he was standing up in when the lightning struck. Living in the past is hard. Dying in the past is incredibly easy. But he must survive, because he has a job to do. He must track down a murderer, teach his younger self how to be a good copper, and change the outcome of a bloody rebellion. But there's a problem: if he wins, he's got no wife, no child, no future.

Sam Vines is a man on the run. Yesterday he was a duke, a chief of police, and the ambassador to the mysterious, fat-rich country of Uberwald. Now he has nothing but his native wit and the gloomy trousers of Uncle Vanya (don't ask). It's snowing. It's freezing. And if he can't make it through the forest to civilization, there's going to be a terrible war. But there are monsters on his trail. They're bright. They're fast. They're werewolves. And they're catching up.

Other children receive xylophones. Susan just had to ask her grandfather to take his vest off. Yes. There's a Death in the family. It's hard to grow up normally when Grandfather rides a white horse and wields a scythe: especially when you have to take over the family business, and everyone mistakes you for the Tooth Fairy. And especially when you have to face the new and addictive music that has entered Discworld. It's lawless. It changes people. It's called Music With Rocks In.

This isn't real life. This isn't even cheese mongering. It's opera - where the music matters, and where an opera house is being terrorised by a man in evening dress with a white mask, lurking in the shadows, occasionally killing people, and, most worryingly, sending little notes, writing maniacal laughter with five exclamation marks. Opera can do that to a man. In such circumstances, life has obviously reached that desperate point where the wrong thing to do has to be the right thing to do.

When a large, heavily fortified and armoured empire makes a faintly menacing request of a much smaller, infinitely more cowardly neighbour, it would be churlish, if not extremely dangerous, not to comply; particularly if all they want is a wizard, and they don't specify whether competence is an issue.

Religion is a controversial business in the Discworld. Everyone has their own opinion, and indeed their own gods - who come in all shapes and sizes. In such a competitive environment, there is a pressing need to make one's presence felt. And it's certainly not remotely helpful to be reduced to be appearing in the form of a tortoise, a manifestation far below god-like status in anyone's book. In such instances, you need an acolyte, and fast - preferably one who won't ask too many questions.

Mightily Oats has not picked a good time to be priest. He thought he'd come to the mountain kingdom of Lancre for a simple little religious ceremony. Now he's caught up in a war between vampires and witches, and he's not sure there is a right side.

DEATH IS MISSING: PRESUMED...ER...GONE....which leads to the kind of chaos you always get when an important public service is withdrawn. Meanwhile, on a little farm far, far away, a tall dark stranger is turning out to be really good with a scythe. There's a harvest to be gathered in.

Never let real life get in the way of a good story, especially when a good story involves three witches, including a fairy godmother, and travelling to a faraway land to make sure that a servant girl doesn't marry a prince. It looks as though a happy ending may be averted before catastrophe strikes. But unfortunately, the forces of good are up against a godmother who has made Destiny an offer it can't refuse.

William de Worde is the accidental editor of the Discworld's first newspaper. Now he must cope with the traditional perils of a journalist's life: people who want him dead, a recovering vampire with a suicidal fascination for flash photography, some more people who want him dead in a different way and, worst of all, the man who keeps begging him to publish pictures of his humorously shaped potatoes. William just wants to get at the truth.

The alchemists of the Discworld have discovered the magic of the silver screen. But what is the dark secret of Holy Wood hill? It's up to Victor Tugelbend ("Can't sing. Can't dance. Can handle a sword a little") and Theda Withel ("I come from a little town you've probably never heard of") to find out. Moving Pictures, the ninth Discworld novel, is a gloriously funny saga set against the background of a world gone mad!

There's nothing like the issue of evolution to get under the skin of academics. Especially when those same academics are by chance or bad judgement deposited at a critical evolutionary turning point when one wrong move could have catastrophic results for the future. Unfortunately, in the hands of such an inept and cussed group of individuals, the sensitive issue of causality is, sadly, only likely to receive the same scant respect that they show to one another.