Heath's moderately competent British horror movie is that old stand-by – the story of an outsider taking his revenge on the superior folk who some years before humiliated him. In this case, five obnoxious graduates of an unnamed university are lured to the birthday party of a rich contemporary at the family's rural seat. There, they're confronted by his deranged brother, damaged after three tours in Afghanistan and making good use of his military training. A dislikable crowd whose violent comeuppances are unlikely to make the audience warm to them.