Matt and Julie head to her parents' big, remote house in the country, with their children Kayleigh, Carol and Robert, for a day out with friends and family. They intend spending the warm, summer's day doing nothing more strenuous than engaging in light, casual conversation, eating lunch and drinking tea, while the kids play in the background.
At least, that's the plan…
The kids disappear, only to return utterly, fundamentally changed. Something bad has happened to them, something very bad.
The day becomes a pitched battle between the adults and the violent psychopaths their children have become. How can the adults survive against such an enemy, how can they even fight back, when the very thing they have to fight against is their own flesh and blood?
