Terry Pratchett: The Spirit of Fantasy by Craig Cabell
This book was so-so. The blurb states "featuring an in-depth look at the man and his work, as well as on-screen adaptations and a collector's guide, this is essential reading for any fan". However, I found this book does not really discuss Terry Pratchett or his life. So it's not much of a biography. Cabell selects a few of Terry Pratchett's books and does a brief analysis on them, but it reads more like a college paper than an "in-depth look at the man and his works". The collector's guide section is a list of almost everything type of adaptation and book Terry Pratchet wrote/ was involved in. Something you can probably find on his website. If you want to know more about Terry Pratchet, then I recommend reading the authors own words which is supplied in A Slip of the Keyboard: the Collected Nonfiction.