Lucía faces the complicated situation of caring for her husband after a recent accident.

Luis is a film score composer. He has only a few days to deliver his latest work, and time is running out. He spends day and night at the piano, barely sleeping. He knows that if he loses this opportunity, his career is over. The stress is mounting. But a strange feeling begins to creep over Luis; he thinks someone is watching him. Someone inside his solitary apartment. And perhaps Luis isn't as alone as he thinks...