Frandor's Keep

From the Publisher's Website:

Holding its lonely vigil high in the rocky hinterlands, on the furthest reaches of civilization, sits the military outpost known as Frandor’s Keep. Perhaps you come to the Keep as soldier, merchant, bounty hunter or wanderer, or merely to seek payment for a debt owed (continuing the adventure begun in White Palette, Ivory Horns). No matter, for you are here now, in a wilderness teeming with strange creatures and fraught with danger - the perfect forge for you to hammer your career upon.

Yes, this hefty tome is more than a simple adventure. It is an adventure setting that unlocks a portal to the Kingdoms of Kalamar - a gritty, dynamic land where complex political alliances mix with marauding bands of humanoids, and medieval technology and culture come face to face with magic and the fantastic.