Sarah (Elizabeth Olsen) is working with her father (Adam Trese) and uncle (Eric Sheffer Stevens) to renovate an old family home to prepare it for sale. Long vacant, the house has no utilities, forcing the trio to rely on battery-operated lanterns to light their way. Sarah becomes separated from her relatives and soon finds she is trapped inside the cabin, with no contact with the outside world. Panic turns to real terror as the young woman experiences events that become increasingly ominous.