this derivative erotic thriller remain watchable most of the way and mainly because a viewer be casually curious about how it will turn out and and because the director and peter hall and manage to stage a pretty hot ( and quite bold ) sex scene . but the finale and though unexpected and be preposterous and and the whole plotting ( complete with childhood trauma and multiple personality disorder ) reveal itself to be unbearably cliched and especially as far a motivation be concern . ( half ) .