The cold winter is coming, and a group of young men and women including Daniel (Dean Armstrong), Kenya (Jennifer Pudavick), Bridget (Kaitlyn Wong), and Jeanna (Terra Vnesa) are going on vacation in the snow-capped mountains. Unexpectedly, they lost their way and came to a completely unfamiliar place. The cold blizzard is about to hit, and everyone has no choice but to find an abandoned building to temporarily live in. From the information left in the building, it is learned that this was once a sanatorium called Glenville, which was specially used to accommodate marginalized people who were described as weird and extremely dangerous. In the early years, the sanatorium released a horrific and bloody riot and was eventually abandoned. The young people sang and sang here, but they didn't expect that there were several deformed people living here. They didn't seem to welcome this group of uninvited guests. As night fell, the inhumane massacre quietly unfolded, and the young people ushered in the most terrifying holiday...