Neverwinter Nights: Shadowguard is a premium module for Neverwinter Nights.

As the son of the Magistrate of the imperial city of Ghaarak you joined the Imperial Academy. Your astonishing work there brings up the interest of the ShadowGuard, an elite group of imperial agents and they ask you to join them. But as you get a deeper inside look into the organization, you discover that nothing is as it seems and the city Ghaarak is on the brink of destruction due to the Shadowguard.