Here in one volume is a collection of many of the shorter works published by Sir Terry Pratchett down the years.
About two thirds of the stories in the book are not anything to do with Discworld. But the final third of the book is nothing but stories in Discworld and related to it.
The book runs for three hundred and eighteen pages. There's an introduction from noted writer A.S. Byatt. And Terry Pratchett himself gives a short introduction to each story, explaining how they came to be.
The earliest story in the book, 'The Hades Business' was something he wrote when he was thirteen. It's a little rough at first but it does get quite good after that once you get used to the writing.
The rest of the first section contains storys that are mostly quite short, no more than a couple of pages to five or six, although there are a couple that go a bit longer. There's also a story that formed the basis for his recent collaboration The Long Earth
As a whole, this section isn't bad at all. Some of the stories are short one joke ideas, some are poems, and a couple are serious science fiction. It's up to the reader, if you're only used to his Discworld writings, if you'll take to all this or not. It does though show a fascinating picture of how he has developed as a writer over the years.
The Discworld portion of the book contains one short story with Cohen the Barbarian, a short story involving the Nightwatch, then a very long one involving Granny Weatherwax and Nanny Ogg. This is a superb story and well worth reading.
All the ones after that are shorter pieces that supply supplementary material to novels like 'Thud' and 'Unseen Academicals' and one is a speech made at a festival in Wincanton. To say why would be to spoil it.
These are all rather rare pieces though and for the completist this is thus an invaluable volume.
There's an appendix with a scene cut from the Granny Weatherwax story. And there are three sections of illustrations, nearly all by the late great Josh Kirby, of book covers and other pieces from down the years. There is an index to these at the back.
Some of the items in the book have been published elsewhere but this is the first you will have probably seen of others. So it's an excellent and comprehensive collection and, so long as you're prepared to give the non-Discworld material a chance, well worth getting.