The Hogswatchnight yuletide season is disrupted by the evil deeds of the Auditors, who replace the red-suited Hogfather with a scythe-bearing demon, prompting the Unseen University wizards and their monster-bashing nanny to launch a rescue plan.

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.

Change is afoot in Ankh-Morpork - Discworld's first steam engine has arrived, and once again Moist von Lipwig finds himself with a new and challenging job.

IT'S A RAT-EAT-RAT WORLD . . . Every town on Discworld knows the stories about rats and pipers, and Maurice - a streetwise tomcat - leads a band of educated ratty friends (and a stupid kid) on a nice little earner. Piper plus rats equals lots and lots of money. Until they run across someone playing a different tune. Now he and his rats must learn a new concept: evil . . .

Nine-year-old Tiffany Aching thinks her Granny Aching - a wise shepherd - might have been a witch, but now Granny Aching is dead and it's up to Tiffany to work it all out when strange things begin happening: a fairy-tale monster in the stream, a headless horseman and, strangest of all, the tiny blue men in kilts, the Wee Free Men, who have come looking for the new 'hag'. These are the Nac Mac Feegles, the pictsies, who like nothing better than thievin',...

A real witch never casually steps out of her body, leaving it empty. Eleven-year-old Tiffany does. And there's something just waiting for a handy body to take over. Something ancient and horrible, which can't die . . . Wise, witty and wonderful, A Hat Full of Sky is Terry Pratchett's second novel about Tiffany and the Wee Free Men - the rowdiest, toughest, smelliest bunch of fairies ever. They'll fight anything. And even they might not be enough to...

It isn't easy being a teenage pharaoh, having to deal with assassins, sphinxes, mad high priests, gods, sacred crocodiles and marching mummies. And all you really want is the chance to do something for young people and the inner cities.

As it moves towards a seemingly inevitable collision with a malevolent red star, the Discworld has one possible saviour. Unfortunately, this happens to be the singularly inept Rincewind, who was last seen falling off the edge of the world.

Cameras roll on the fantastic Discworld when the alchemists discover the magic of the silver screen. But what is the dark secret of Holy Wood hill? As the alien cliches of Tinsel Town pour in, it's up to Discworld's first film stars to find out.