Grace (Jennifer Lawrence) and Jackson (Robert Pattinson) move into a remote house to welcome their first child. Their new life proves far more difficult than they expected. Spending long days alone with their child, Grace begins to exhibit increasingly strange behavior. Uncontrollable waves of lust, irrational fear, and even aggression plunge their family into increasing chaos. As Grace's reality gives way to wild fantasies, it becomes clear that something deeply disturbing is happening to her.