Tomb of The Ice King

From publisher blurb: A sudden snowstorm in the mountainous Northern regions prompts the party to seek refuge in a mountainside fortress. Though it seems long abandoned at first, it becomes clear that a sinister spirit resides within the dungeon walls. This adventure begins with a survival scenario in the blizzard, and then unfolds into an exploration-based dungeon crawl, with the final confrontation against a horde of undead and their villainous ruler.