Strange, gripping drama for the first 90% of the movie. McDowell plays his character with a weird calm intensity that keeps your eyes glued to him. Madolyn Smith-Osborne, a terrific actress here and someone who I never heard of, plays a woman who looks like she's about to come unhinged at any moment.
Part of the problem with this very dialogue-intense movie is that it builds up to such a dramatic climax that it's impossible to keep it going through any explanation of what's really going on. And the explanation really cheapens things.
What's really great about this movie is the interplay between the two (and only two) characters. In some parts it's brilliant. I wish I had stopped watching some time before Smith-Osborne got all her points, however.