Unknown to the humans, they share the Earth with another intelligent race, the nomes. The reason they don't know about the nomes is that they are four inches tall, and live at a pace ten times that of humans. This is the story of Masklin, and other heroic nomes who lead their people out of the dangerous world of humans, in search of their home. In the course of this story the overcome great obstacles, all with wit and humor.
This book is actually a collection of three book: Truckers, Diggers and Wings. The stories showcase Terry Pratchett's wit and humor, his ability to examine the human experience from a very different viewpoint. The action is gripping, and the humor outrageous. I highly recommend this book.