Alex is a trisomic man, stuck in a wheelchair since a mysterious fall in the stairs. Alex is traumatised by his parents: Max, a frustrated composer turned completely mad and violent; and Marie, a cold and hysteric woman. Alex's only friend is his sister Melinda, who's been taking care of him for years. But Melinda, 9-month pregnant of an unknown man, also maltreated by her parents, is about to leave the family home to start a new life, leaving Alex behind. And just then, at the peak of the family crisis, a mysterious door appears in the house, at a place where there was nothing before. And everyone who enters it disappears in a terrifying scream.