Alfie wakes up one night to find his twin daughters at the foot of his bed, claiming there's a shadowy figure in their bedroom. When no such thing can be found, he assumes the girls had a nightmare. He isn't surprised that they're troubled. Grief has made its home at Hart House: nine months ago, the twins' mother, Pippa, died unexpectedly. But the situation quickly develops into something more insidious. The girls set an extra place for him at the table. They whisper to him. They say he's going to take them away. Alfie calls upon Julia --- Pippa's sister and a psychiatrist --- to oust the malignant tenant from their lives. But as Alfie himself is haunted by visions and someone watches him at night, he begins to question the true character of the force that has poisoned his daughters' minds, with dark and violent consequences.