I just finished watching this little gem and all I can say is "wow"! It's a French horror/thriller film from 2003 and the literal translation of its title is "High Tension". I really don't want to give away any of the plot as I think the best way to view this film would be to go in without any prior knowledge, other than it's very good. The version I saw was dubbed in English, very badly, and that's really the only complaint I have about it. I think there's another version that's censored, but I'm pretty sure the version I saw was uncut. Had to be, had some pretty gruesome scenes in it. It lives up to its title, very intense and well done, go see it!