Strata by Terry Pratchett was a quick but entertaining read. It's about a company that manufactures planets much like Magrathea from The Hitchhiker's Guide to the Galaxy. The main character is contacted by a stranger who claims to have found a flat planet seeks to hire her to investigate this flat "discworld". She joins up with this stranger and other crew members on an expedition to explore this planet to try to determine how it was built and by whom.
It's been many years since I read this book so most of it was like reading it for the first time. There were some bits I remembered though and laughed at them just as much as I did the first time. I especially liked the ending. I don't recall if I was as surprised by the ending the first time I read the book since it was so long ago, but it really wasn't what I was expecting and I thought it was very clever.
On the whole I enjoyed it very much and would recommend it to fans of Terry Pratchett's Discworld series. The disc planet in this book is not the same one that is featured in the Discworld series, but it gives you a glimpse into how Pratchett first came up with the concept of Discworld, so I like to consider it a sort of unofficial prequel to the series.
The only thing that bothered me about the book was that there were some parts where it felt like events weren't quite in order, especially towards the end. Eventually I figured out that this was due to flashbacks and it wasn't immediately clear that's what was happening as I was reading it. It's possible this is just due to the way my ebook is formatted, but I don't feel like digging out my paper copy to thumb through it and check.