Horrific, horrendous, unspeakable, The Whitechapel Murderer, Jack the Ripper, stalked the streets of East London in 1888, slaughtering prostitutes and bewildering the police who were hunting him. They never succeeded in apprehending him, and to this day the mystery of his identity remains an enigma.[...]

A brilliant new Discworld story from Terry Pratchett.
The fourth book in the Science of Discworld series, and this time around dealing with THE REALLY BIG QUESTIONS, Terry Pratchett's brilliant new Discworld story "Judgement Day" is annotated with very big footnotes (the interleaving chapters) b[...]

When a wizardly experiment goes adrift, the wizards of Unseen University find themselves with a pocket universe on their hands: Roundworld, where neither magic nor common sense seems to stand a chance against logic. The Universe, of course, is our own. And Roundworld is Earth. As the wizards watch t[...]

The latest instalment in the "Sunday Times"-bestselling Science of Discworld series.
Roundworld is in trouble again, and this time it looks fatal. Having created it in the first place, the wizards of Unseen University feel vaguely responsible for its safety. They know the creatures who lived the[...]

Roundworld, aka Earth, is under siege. Are three wizards and an orangutan Librarian enough to thwart the Elvish threat?
When the wizards of Unseen University first created Roundworld, they were so concerned with discovering the rules of this new universe that they overlooked its inhabitants enti[...]