From the back of the adventure:
Mystery of the TomeA distressed wife, a missing sage, strange dragon cultists, and a book that takes its readers to strange vistas; all are somehow connected to the Green Regent. It's up to you to find out how.
Book Knowledge is an adventure for the Dungeons & Dragons (3.5 Edition) game. It can either be played as a stand-alone adventure, or as part of the LGR - Legacy of the Green Regent™ campaign offered by the RPGA. Designed to challenge 7th-level D&D heroes, the PCs are tasked to find a lost sage who traffics in strange books.
To use this adventure, a Dungeon Master also needs the Player's Handbook (D&D 3.5e), the Dungeon Master's Guide (D&D 3.5e) and the Monster Manual (D&D 3.5e). This adventure is set in the Forgotten Realms game world, and it may also be useful, but not necessary, to also have a copy of the Forgotten Realms Campaign Setting.