I've seen so many variations of this story that I almost didn't watch it, and if I hadn't I wouldna missed anything. That said, this was four excellent actors so the play was satisfying even though we knew exactly what was going to happen. Minus a point for stupid victims who knock down the bad guy and run without taking advantage of their being stunned or unconscious (don't we all hate that cheap trick?) Can't recommend it strongly but if you like psycho-killer thrillers then it's not the worst pick of the genre.