Pablo, an introverted sound designer, is confined to his home following an injury. He begins to experience visual and auditory hallucinations so vivid that he believes he is losing his mind. Through his window, he spies on the violent relationship between his new neighbors, Héctor and Renata, eventually becoming obsessed with it. Chance encounters on the rooftop lead to an intimate bond that culminates in a plan to get rid of the husband. An unexpected event forces him to re-evaluate his own existence.