Sarah Tyler (Isabella Calthorpe, How To Lose Friends) returns to her troubled family home, for a much put-off visit. As a storm rages on, Sarah, her brothers and a couple of friends (Tom Felton, Harry Potter & Gemma Atkinson, Baseline, Boogie Woogie) are isolated in their countryside home for the night, cut off from the outside world, drinking themselves into oblivion. But something devastating comes out of the driving rain and darkness. Trapped and scared, the besieged group turns in on itself. The few that survive the initial attack, must use their heads as well as their physical strength to stop the thing that is hunting them down one by one - or is the enemy already amongst them?