I had the pleasure of helping nurse this adventure into existence, and I am pretty happy with how it turned out. There is an excellent, well-creepy "ghost story" encounter near the beginning that should worry your players and creep them out. There is some good Lovecraftian stuff with rules for Madness and an evocative alternate ending should the PCs fail. There is some stuff that reminds me of A. Merritt (the interactions with the titular Frost Queen).
This module could easily be used with Transylvanian Adventures, or even with Black Powder, Black Magic, if set in the Colorado Rockies, Alaska, or parts of Canada.
[4 of 5 Stars!]