For Mary, the joy of her infant son Adam's birth is overshadowed by the devastating stillborn death of his twin brother Thomas. Concerned husband Jack relocates them to a spacious new home in secluded suburbia while Mary makes fast friends with their neighbor Rachel. But fresh faces, new surroundings, and even post-partum medication can't spin Mary's haunted motherhood mindset off its deepening descent into horrifying depression. Soon she's convinced that an otherworldly evil wants to claim her remaining baby for its own. Is it madness or is something paranormal not going to stop until another child has been eaten alive?