Adrian (Quim Gutiérrez), the handsome conductor of the Bogotá Philharmonic Orchestra, and his girlfriend Belen (Clara Lago) seem very much in love. But his constant flirting makes them doubt his fidelity. When she discovers a secret, soundproof room in her house, Belen decides to test Adrian by hiding in it and pretending to have left him. However, she accidentally locks herself in and can no longer escape from the room. After Belen's disappearance, Adrian seeks comfort in the arms of the beautiful waitress Fabiana (Martina García). But as they indulge in their passion, they are also confronted with the past, and a series of strange events in the house begin to terrorize Fabiana. New