pussreboots, The last two days I've had a vague mystery plot stuck in my head. I knew it was from a long running series. I knew it took place at a remote lodge up somewhere snowy. I knew it involved a body of water with the name Devil in it.
After doggedly reading through my book reviews (this folks is why I maintain a book blog) I found it!
It's Unraveled Sleeve by Monica Ferris (2001).
https://pussreboots.com/blog/2015/comments_11/unraveled_sleeve.html