The Orphanage(2007)

Lara, who was an orphan herself, takes care of an orphaned boy with her husband. He lives with his family in an old house that used to be an orphanage. Her son Simon says he has five invisible friends, but Lara thinks it's because of his active imagination. Things get serious when Lara sees a mysterious boy wearing a mask, and at the same time realizes that Simon has disappeared. Lara feels the presence of other people in her house and brings a team of parapsychologists there to reveal the secret of this house.