The story of a family and the monsters that are coming for them - monsters that they might know better than they realize.
The creature is snow snake! It's a snake that lives in the snow, and if you're thinking, "that's ridiculous, snakes are cold-blooded!" Well, while you were being all clever it bit you and you died. Congrats.
Reuter's fact-check on Snow Snakes (2021): https://myths.link/snowsnakesreuters
Snopes on Snow Snakes (2014): https://myths.link/snowsnakessnopes