From publisher blurb:
A sleepless evil lingers in the subterranean depths of the Shadowfell.
Gloomy tunnels spill into the dread kingdom of Doresain the Ghoul King, wretched servant of the demon lord Orcus. Neither living nor dead, the Ghoul King casts his shroud of undeath over all who oppose him, and from these fallen enemies he breeds an army. Who can stand against this murderous and hateful force of destruction?
This D&D adventure is designed to take characters from 24th to 27th level. In this adventure, demonic forces plot to usurp the Raven Queen's power over death, and all paths lead to an ancient kingdom hidden in the subterranean depths of the Shadowfell.