Beto is the keeper of a house in Mexico City - empty for several years already - in which he used to work as a domestic help. The solitude of the last ten years, as well the monotony and routine of his job have made him lead a secluded life, which could seem suffocating for most people, whereas for him it provides a safe and stable environment, in contrast to the threatening outside world. He has develop a pathological fear for this world, to the point of limiting his contacts to only two persons: the lady of the house, for whom he has a feeling of deep gratitude and respect that is translated into obedience; and Lupe, a friend, a confident and a lover. Once he learns that the house has been sold, Beto is confronted to the dilemma of gathering the courage to get out and get a life or find a way of remaining in his confinement.