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 entirely. Now, they have noticed humanity. And humanity has company. Arriving in Roundworld, the wizards find the situation is even worse than they d expected. Under the elves influence, humans are superstitious, fearful, and fruitlessly trying to work magic in a world ruled by logic. Ridcully,...

When Charles Darwin writes the wrong book and reverses the progress of science, Unseen University s wizards must once again save Roundworld (Earth, that is) from an apocalyptic end.
Ever since a wizardly experiment inadvertently brought about the creation of Roundworld, the wizard scholars of Unseen University have done their best to put things on the right course. In Darwin's Watch they may face their greatest challenge yet: A man called Darwin has written a bestselling book called The Theology of the Species, and his theory of scientific design has been witlessly...

The wizards of Unseen University are again called upon to defend their creation, Roundworld, this time in a courtroom where its very existence hangs in the balance.
The Omnians fervently believe that the world is round, not flat, and view the discovery of Roundworld as a vindication of their faith. To leave this artifact in the hands of the wizards would be unacceptable. Not only do the academics hold that Discworld is flat, but by creating the Roundworld universe, they have elevated themselves to the level of gods. Ankh-Morpork s venerable tyrant Lord Vetinari agrees to a tribunal,...