The young daughter of a journalist disappears into the desert without a trace—eight years later, the broken family is shocked when she is returned to them, as what should be a joyful reunion turns into a living nightmare.

After her husband's abrupt death, Alice seeks solace with his remaining family — descendants of a leading researcher on demonic possession. As her in-laws transform one by one into creatures that feed on fear, she comes to discover that the vows she took in life survive even in death.