Anyway, during the series peak, in between the original and it's sequel, the creators and writers of the game (two brothers) decided to write some backstory for their creation. The result, 3 books which can now only be found on bookshelves in a Myst Reader type of format with all 3 in paperback form in one giant book. Not something that I was content to live with. The first editions are now only available by scouring used book stores or auction web sites.
All first editions. All hard cover.