On a quiet Spanish coast, Laura returns to the mansion that was her childhood home, an old orphanage that has remained abandoned for years. Now an adult and eager to recreate her life, Laura decides to revitalize the house and turn it into a home for children with disabilities. Accompanied by her husband, Carlos, and her son Simón, she believes that reconnecting with her past could bring them happiness. However, as renovations begin, Simón starts to behave strangely and reveals the existence of an imaginary friend named Tomás, a peculiar boy who wears a bag over his head. Intrigued by curiosity, Laura is captivated, but soon realizes that this friend is not just a figment of Simón's imagination.
As the days go by, Laura becomes immersed in a dark mystery surrounding the orphanage, confronting forgotten secrets that should never have been revealed. The echoes of the past grow louder, and the unsettling figure of Tomás seems to have connections to tragedies of old. Laura's quest to protect her son pushes her to the brink of madness, challenging her perception of reality, life, and death. As horror and despair loom over her, she must uncover the terrible truth that haunts the mansion, all before the past takes her family away. A story of love, loss, and fear that will shake even the bravest.