A little boy from Cornwall aspires to become the ruler of the world. He reads all the books on magic he can find in the castle library, and grows up to be a mean, nasty Wizard. As a result, he develops The Magicians Twitch. This spoils his plans to rule the world. He thinks the cure can be found in the Twith Book of Lore and sets about to get his hands on it. He makes himself their size -- half a thumb high -- and invades their lands of Wozzle and Gyminge. Seven of the Little People escape to the Beyond taking their precious Book of Lore with them. For over a thousand years they live in peace until the wicked Wizard discovers where they were. Now these tiny folk find themselves in constant conflict with the Wizard as he attempts to steal their Book of Lore. His multiple attempts have never been successful, but now he has a brilliant new plan to obtain it once and for all.
In The Magician's Twitch, the Twith face a dreadful dilemma. Should they exchange the book that contains the accumulated wisdom of their ancient seers for something the Wizard says they might possibly value even more? Their future return may be what is in danger.