While coping with the tragic death of their child, a young novelist (Milo Ventimiglia, Heroes) and his wife (Sarah Shahi, The L Word) are struggling just to keep their marriage alive. Their broken romance is put to the test when a mysterious girl (Sara Paxton, The Innkeepers) shows up at their door in the middle of the night claiming masked prowlers are stalking her. The ominous situation turns even darker when the dangerous hooligans show up at their door to wreak havoc. As a game of cat and mouse ensues, the couple must work together to survive and uncover the mystery behind the attack. Soon, past secrets begin to unfold, for better or worse.