From publisher blurb:
An adventure set in the Boroughs of Dunmark for four characters of 4th level.
The gloomy moors of Dunmark have long been rumored to harbor foul things lurking in the darkest of nights. Wise travelers keep their distance from those haunted lands, but those dreaming of uncovering its secrets must venture deep into the Boroughs' swamps. But things far more dangerous than dusty old tomes and lost relics hidden beneath Dunmark, waiting in deadly slumber. As one misguided soul's actions cause the barriers between the waking world and a realm of nightmare to blur, a terror wakes to rule the ruins.
Can the PCs brave a living nightmare to cast its horrors back into an eternal slumber, or will they succumb to its maddening visions of reality?