Cecilia is too afraid one night to let her housekeeper's son into the house. The next day his dead body is found.
Sebastián is a locksmith who begins to have revelatory visions about his clients every time he touches their locks. This power complicates his life.
With her girlfriend lying comatose in the hospital, after having found her lifeless body in the bathtub, Clara starts the path of physical and psychological transformation with the goal of possessing her girlfriend again in some way.
