"Let the Right One In" is a Swedish film directed by Tomas Alfredson, released in 2008. It is based on the novel by John Ajvide Lindqvist and tells the story of a young boy named Oskar who befriends a mysterious girl named Eli. Set in a suburban neighborhood during the 1980s, the film explores themes of loneliness, friendship, and the struggle between innocence and darkness. Eli is revealed to be a vampire, which complicates their relationship as Oskar becomes entangled in her dark world. The film is noted for its unique blend of horror and coming-of-age elements, as well as its atmospheric cinematography and haunting score. It has received critical acclaim and has been influential in the vampire genre.