The Children (15)

Two families arrive at a holiday home one snowbound Christmas, and all seems well: the adults are smug marrieds, the kids are cute moppets, and teenager Casey (Hannah Tointon) wonders what she's doing there. Tom Shankland's horror flick takes hold when a mystery virus turns the children into staring Midwich Cuckoo types who plainly don't like grown-ups. Careful with those knives, kids! The idea of cosseted middle-class tots becoming feral psychopaths has potential, though most of it is squandered by uncertain direction and some unconvincing psychology.