Sonia’s life was perfect at first. Her theatre career is improving and Óscar the man who is having an affair with her promises her to leave his wife for her soon. But suddenly her life descends into a downward spiral of terror when she receives photos of them two being together. This is the trademark of a serial killer who already has killed four women and now Sonia is the next target.

Luisa thinks that she lives under the shadow of her parents. She has the felling that all her life has been designed by them. Neither her promising career and support of her boyfriend, Ruben, seem to remove that idea from her head. Also, some horrific events of her childhood are going to return to her life with devastating force, bringing more distress and grief... And maybe murder. Luisa's going to have to deal with a situation that completely gets over her. Because, how you defend yourself when your worst enemy is... yourself?

Gustavo is moving out. After several weeks of delaying the move, he has run out of excuses. The time has come to pluck up his courage and leave the family nest. But when Pilar, his wife, and Sofía, his seven-year-old daughter, come home, he is still there. A sparrow has flown in through the window and he can't get it out. Sofía thinks the little bird is a gift from her dad, and Pilar thinks it's another one of Gustavo's tricks to avoid leaving.

Professor Jorge Ollot and Dr. Iris de Miguel have gathered a group of people, carefully chosen, with whom they will be isolated for a week in a secluded house. Their intention? To demonstrate that the paranormal exists, but that it is our own mind that provokes it.