It felt like a disastrous dinner party—that’s really what it was. We discover early on that Sarah (Shirley Henderson) and her husband Tom (Alan Tudyk) are being forced to sell their expensive house due to repossession. For reasons I couldn't quite grasp, they decided to have old friends Richard (Rufus Sewell) and Beth (Olivia Williams) over for a meal. It was Beth who complicated matters by bringing along the mysteri…