1976. City of Madrid, Madrid (center to Spain and country's capital). On the early days of The Spanish Transition after General Franco's death happened the previous year, family Olmedo moves to the big city from their natal town hoping to get money and a better life for everyone. They are Manolo, a farmer hired to work in the well-known Pegaso's truck company; his wife and previous sister-in-law Candela, hired to work in the too well-known shopping mall Galerías Preciados; oldest son Pepe, a shy and stammer 20-years old young who feels as a stranger in the city unable to find job; older daughter Amparo, a 17 years-old teen forced to leave the town and her boyfriend Mateo to live in Madrid, who dreams to live in Paris working as flight attendant for Iberia's flying company; the child Rafael "Rafi", the only one son of Manolo and Candela after Candela's first husband (father of Pepe and Amparo) left them; a finally Fermín, Candela's aging and senile father with troubles of memory. However, things go bad from the beginning: Rafi is kidnapped when an evil entity takes advantage of a brief moment where Amparo left him alone to watch Fermín, while Pepe watches and obsesses with a young woman in the window in front of him own, using the clothes line for sending hand-written messages each other. Full of fear and desperation, Manolo and Amparo call the police, whose don't find the child. Feeling the evil force in the house, Amparo gets contact with Rafi, hearing him scream in the empty house next to them and making all to enter the house, not locating him but living frightening encounters inside it. Convinced that the house is haunted, Amparo finally locates and rescues Rafi, but in a state of fear unable to talk. While Amparo looks for her own answers about the house where they live, Candela meets in her job nice old lady Sra. Maruja Dávalos and her daughter Lola, a quadriplegic young girl but too a spiritual medium. Desperate after Dávalos' warning about the danger all they live to move there, Candela asks help her and Lola for discovering the secrets of the house to save the family, at the same time that the clues followed by Amparo point to a sinister past happened in the house, and an evil being determined for all to get it wants.