From publisher blurb:
The Frostbale Mountains. The majestic giants that overlook all of Hellick Water. From the northern village of Shadn Valley down to the small southern plains town of Marshwind, these mountains act not only as a towering shadow but as a barrier blocking and protecting this thriving land of many races from the Black Wastes--a land of demons, vampires, barbarians, and the undead--just beyond the reaches of the peaks. Still, sometimes something dark manages to crawl over the mountains into this realm. Someone like The Bone Lord.
The 12 Dungeons of Winterspiel is a holiday adventure module for the Micro Chapbook Roleplaying game system set in the mountain region of Hellick Water.
It is the fourth volume in the Bone Lord Chronicles story arc. Thus, this adventure may be played on its own or as a part of the larger campaign series of books.