Lidia and her father, Pablo, return to the family lighthouse after her mother’s death. Pablo, aware of Lidia's fragile emotional balance, worries for a possible relapse after her suicide attempt. Lidia, annoyed by her father's lack of trust, will discover that something’s not right at the Lighthouse, and that danger awaits for them if they do not find out the truth.

Laura, a Spanish woman living in Buenos Aires, returns to her hometown outside Madrid with her Argentinian husband and children. However, the trip is upset by unexpected events that bring secrets into the open.

Jaime, a doctor who lives in Seville, finds his life radically changed when his son is left fighting for his life after being beaten up during a robbery. The feelings of pain and helplessness soon change to feelings of hate and anger, converting a good dad into a dehumanised man.

Marc and Rebeca, a young couple, travel to an old country house that used to belong to their family. Once there, they write the shared history of their roots, creating a huge family tree that harbours relationships of love, heartbreak, sex, madness, jealousy and infidelity, and under which also lies a history laden with secrets.

Malasaña neighborhood, Madrid, Spain, 1976. While political turmoil ravages the streets all over the country, the Olmedo family arrives in the big city and settles into their new apartment. They soon discover that they are not the only ones roaming its corridors.

Adolfo, the town's priest, gets a phone call from a desperate family. They believe that their daughter is possessed by the devil.