I'm hoping to rediscover a mystery story I read when I was very young.
The body of a woman had been discovered miles from a remote lodge with no obvious means of death. A detective suggested that she had been trapped in a wet sheet and left in the cold to freeze. The entire icy deathtrap was then pushed from a slope and drifted downhill ultimately coming to rest miles from any habitation. He demonstrated the whole scenario using a wet napkin and a clothespin. It wasn't a full novel, but a short story, perhaps reminiscent of a Poirot mystery. This would be in the late 70s or early/mid 80s. It may also have been in a story collection that included "Thus, I refute Beelzy" by Collier.