Phandalin After Dark

Publisher's blurb:

In Phandalin After Dark, players investigate the mysterious disappearance of Phandalin, a once-thriving mining town that vanished, leaving no trace that the town was ever there at all.

The party learns it vanished into the Shadowfell, and that something malevolent has infested Tresendar Manor, the long-abandoned mansion at the edge of town.

After exploring the town to their content, the adventurers arrive at Tresendar Manor and must navigate through haunted rooms, confront vengeful spirits, and ultimately face the shadow demon Korrfok to return Phandalin to the Material Plane.