A full moon hangs in the night sky and lightning streaks across dark storm clouds. Sarah Tyler returns to her troubled family home in the isolated countryside, for a much put-off visit. As the storm rages on, Sarah, her family and friends shore up for the night, cut off from the outside world. But something comes out of the driving rain and darkness. Something that holds a dark secret so devastating that, in one night, it could wipe out the entire family.....