Let the Right One In (novel)

Let the Right One In (Swedish: Låt den rätte komma in) is a 2004 vampire 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 grapples with the darker side of humanity, including such issues as existential anxiety, social isolation, fatherlessness, divorce, alcoholism, school bullying, paedophilia, genital mutilation, self-mutilation, and murder.

The book was a bestseller in the author's home country of Sweden; it was translated into several languages, including English.

It has been adapted as three independent films, a play, and a television series. A Swedish-language film, Let the Right One In, directed by Tomas Alfredson, was released in 2008. Another adaptation was created in English and based on Lindqvist's screenplay. Entitled Let Me In, it was directed by Matt Reeves and released in 2010. An English-language stage adaptation premiered in 2013.

The 2021 Irish horror comedy film Let the Wrong One In is loosely based on Lindqvist's novel.

American network TNT ordered a pilot episode for a television series based on the novel, to premiere in 2017. TNT ultimately passed on the series. In 2021, Showtime gave the Let the Right One In series a 10-episode order, to be produced by Tomorrow Studios and starring Demián Bichir. The series premiered on October 9, 2022.