good movie and all element of a good movie be there and story and actor and script and and direction . i be on the edge of my seat the whole time . no question about it and be a low budget film and but i like it more than many big budget film . andres bagg play martin sander and who be deal with his unfaithful wife . then a voice in the telephone and then just fear . virginia lustig be beautiful and bring a powerful performance . she be an excellent part to the film . i like the increase ambiguity near the end and even though we know that the main character can be involve and we continue see everything from his point of view and ask represent who be the killer .