I'd like to identify a movie (possibly made for TV, but in full movie length) I watched on TV in the late 80s or early 90s.
The action takes place in winter in a small town in northwestern USA or Canada. An man reports his wife missing to the police. (I think they were in town for holiday, or rented a house for the winter).
He suspects a crime, seems very worried, and gets angry at the police as the investigation does not seem to go anywhere, or they do not seem to take the matter seriously. He remains the point-of-view character during the whole movie. At the end the surprise reveal is that he himself killed his wife and hid the body, and the police actually suspected him all along and only played dumb.
I also remember that the movie was based on a theatre play.