This French horror movie, which kindly spared reviewers a preview, is subtitled "What are your boundaries?" Internet Movie Database (www.imdb.com) describes the plot as: "A gang of young thieves flee Paris during the violent aftermath of a political election, only to hole up at an inn run by neo-Nazis." A quick check of the movie's Web site helped at least one editor discover her boundaries. Rated NC-17 for extreme sadistic, graphic violence and gore, the movie opens today at the Varsity.