From the introduction:
Orcs and their allies are once more raiding the borderlands. Gathering under the banner of the wyrmskull, these nonhuman raiders have struck caravans and settlements alike. Fearing a new force of darkness is gathering in the hills, local lords are organizing a group of adventurers to enter The Ruins of Wyrmskull Keep and discover if the source of these attacks lairs there and if so, end it. The ancient orc citadel has been unoccupied for more than a century, though, or so it is commonly believed, so who knows what lurks there now. And what force is guiding these new raids is equally unknown. Gathering outside the dark entrance to the crumbling keep with swords and lights in hand, you will soon find out if you can survive The Ruins of Wyrmskull Keep.