Lucía's heart misses a beat when she sees a man of her age, Juan in a department store. Without hesitating, she decides to follow him to his house, the same house where, twenty-five years ...

The film revolves around Luis and Marta, whose lives are paralyzed by the outbreak of a disease that is accompanied by guilt, lies and fear, thus testing the stability and love of the couple.

Marta settles into his new apartment with his partner. But that night is bound to be alone. The building is newly built and have barely begun to change the first neighbors. All is silent, empty - until someone knocks the door violently.