Snowbound, by Bill Pronzini

This is a fun book about nefarious and just unpleasant people. There are only a couple of likeable folks in the story, but it's hard to put the book down.

It all starts with a holdup in a Sacramento bank that goes awry. The thieves have planned for everything, except what actually happens. They get away safely except for a stray bullet one of them takes...and the death of one of the security guards.

Their hideout is a carefully chosen "safe house" in the mountains near a very small town. Within a week of their arrival--posing as businessmen--the valley is snowed in, cut off from the outside world by an avalanche. One of the robbers cooks up a scheme to rob whole valley--he's sure there is a load of cash in the shops--while everyone is still snowed in, and escape on snowmobiles.

Unfortunately, for the other two robbers and the residents of the valley, this guy is not only a careful, thoughtful planner, he is stark raving insane. So they all follow his plan, waiting for him to make a mistake.

Dated, of course, because it's over 30 years old, but a lot of fun to try to see how it's all going to come together only to fall apart.