This is a rare thing – an ingenious horror film which is utterly itself and not exactly beholden to any of the bogeymen that have sundered the art in the last few decades. If it has antecedents they lie in the 1970s films of John Carpenter. The widescreen photography by Michael Gioulakis is particularly impressive. Slow, daylit, beaches, school, the swimming pool, the living room, your kitchen. So what’s it about? The dangers of sex in the suburbs – it depersonalises all of us and we are no more than carriers of a contagion which just kills us all. Particularly if you have sex with your mother. That is a very bad thing. Alienation is just another wound sent to torment us. David Robert Mitchell is a gifted storyteller. A modern classic.