When hired to provide in-home end-of-life care for an elderly woman, hospice nurse Julia finds
herself staying at a remote cabin. Adriana, her patient, has severe dementia and caring for her
isn't easy. It's all made worse when Adriana's ex-husband Randall shows up demanding to be let
in. Randall and his sons soon lay siege to the house, Julia unable to escape, as they claim
something ancient and evil is trapped inside with her. She stumbles across old film footage of a
Young Adriana and Young Randall discovering an ancient sacrificial cave site in France. As
Adriana's behaviour grows wilder and more dangerous, Julia comes to realize Randall is right.
The couple brought something back with them from that cave, something dark and hungry that
has now possessed Adriana. Randall and his crew break into the house to perform an exorcism,
but Adriana is too much for them and begins a gruesome slaughter. Julia is forced to piece
together Adriana's past and re-discover the ritual the old woman had concocted to banish the evil
for good.