In the dark corridors of a hospital, the ghost of a nurse known as 'La Planchada' (The Ironed One), famous for her impeccable appearance, roams. While patients believe she is there to help them, nurses and doctors know the truth: they must follow her rules to the letter. 'Don't forget anything. Don't get distracted. Don't socialize with the staff. Don't ever fall asleep.' Rebeca, a new nurse on probation, must not only prove herself to her superiors, but also face this mysterious and feared entity.