As the devoutly single Don Johnston is dumped by his latest girlfriend, he receives an anonymous pink letter informing him that he has a son who may be looking for him. The situation causes Don to examine his relationships with women instead of moving on to the next one, and he embarks on a cross-country search for his old flames who might possess clues to the mystery at hand.
When new parents Alex and Penny retreat from the city and move into a place outside town, the stress and massive sleep-deprivation caused by their infant has both of them seeing things in the house that may or may not exist. Persistent sightings of a strange woman has each of them wondering if they are suffering from hallucinations, or if their new home holds a dark, supernatural presence. As their fragile grasp on reality spirals into delirium, Alex and Penny find themselves nearly helpless to deal with the horrific truth of what is really going in this house.