Låt den rätte komma in (Let the Right One In) is a 2004 vampire fiction novel by Swedish writer John Ajvide Lindqvist. The story centers on the relationship between a 12-year-old boy, Oskar, and a centuries-old vampire child, Eli. It takes place in Blackeberg, a working class suburb of Stockholm, in the early 1980s. The book focuses on the darker side of humanity, dealing with issues such as existential anxiety, school bullying, paedophilia and murder.
The book was a bestseller in the author’s home country of Sweden and was translated into several languages, including English. A Swedish-language film, Let the Right One In, directed by Tomas Alfredson, was released in 2008 to widespread critical acclaim. An English-language film adaptation (based on the original Swedish screenplay and novel), directed by Matt Reeves, was released on October 1, 2010, titled Let Me In, which was also well received by critics.