George (Reynolds) and Kathy Lutz (George) and their three children move into a house that was the site of a horrific murder a year before. They decide to keep the house and try to keep the horror in the past. This is until, George starts to behave weirdly and their daughter, Chelsea (Moretz) starts to see people. What now follows is 28 days of sheer terror for the family.

New adaptation of the classic Lovecraft tale is set in Louisiana and tells the story of several scholars headed by Henry Armitage who discover the secret to destroying mysterious, other-worldly beings that threaten humankind.