The film received critical acclaim, with praise for the performances of the two leads, the cinematography, screenplay, and direction. It was released in Sweden on 24 October 2008 by Sandrew Metronome.

Let the Right One In premiered at the Gothenburg Film Festival on 26 January 2008, where it received the Nordic Film Prize. The film was produced by EFTI, Sveriges Television and Filmpool Nord, with support from the Swedish Film Institute, Nordisk Film & TV Fond, WAG and Canal+.

Principal photography took place in 2007 in Luleå, with additional filming in Blackeberg. Leandersson's role in the film was dubbed by Elif Caylan. In the end, Kåre Hedebrant and Lina Leandersson were chosen for the leading roles. Selecting the lead actors involved a year-long process with open castings held all over Sweden. Alfredson, unconcerned with the horror and vampire conventions, decided to tone down many elements of the novel and focus primarily on the relationship between the two main characters and explore the darker side of humanity. The film tells the story of a bullied 12-year-old boy who develops a friendship with a strange child in Blackeberg, a suburb of Stockholm, in the early 1980s.Ī film adaptation of Lindqvist's novel began development in 2004 when John Nordling acquired the rights to produce the project. Let the Right One In ( Swedish: Låt den rätte komma in) is a 2008 Swedish romantic horror film directed by Tomas Alfredson, based on the 2004 novel of the same title by John Ajvide Lindqvist, who also wrote the screenplay.

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