Let the Right One In is a Swedish horror film directed by Tomas Alfredson. The story revolves around a young boy named Oskar, who befriends a mysterious girl named Eli, who turns out to be a vampire. As their friendship grows, Oskar discovers the dark secrets of Eli's existence. The film beautifully captures the atmospheric and chilling landscapes of Sweden, while also exploring themes of loneliness, friendship, and the blurred lines between good and evil.