Oscar is bullied at school and ignored by his mother. A young girl who turns out to be a vampire moves in next door and helps him find love and revenge in Let the Right One In.
*The title of the film (as well as the novel upon which it was based) refers to the Morrissey song "Let the Right One Slip In". In addition, it also refers to the fact that, according to vampire myths, vampires must be invited in before they can enter someone's home (this is shown in the film when Eli asks Oskar to invite her into his apartment).
*Though the film takes place in Blackeberg, a suburb of Stockholm, the film principal photography was shot in Luleå in the north of Sweden, to ensure enough snow and cold weather.
*Several tricks were used to create the right sound effects for some of the gorier scenes. Biting into sausages was used to replicate biting into skin and flesh, and drinking yogurt was used to sound like drinking blood. The sound of the children blinking was made by the skin of a grape rubbing against each other in an almost 'blinking' motion.