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In the film Let the Right One In (2008), the title carries both a literal meaning rooted in vampire folklore and a metaphorical meaning regarding emotional vulnerability. While the exact phrase "Let the right one in" is never spoken as a "title drop" by the characters, the central concept is explicitly discussed and demonstrated in a pivotal scene.
The title serves as a dual-layered reference:
No character says the exact title, but the "invitation rule" is the subject of a specific, visceral scene that defines their relationship.
The title was chosen by the novel's author, John Ajvide Lindqvist (who also wrote the film’s screenplay), as an homage to the 1988 Morrissey song "Let the Right One Slip In." The lyrics of the song—"Let the right one in / Let the old dreams die / Let the wrong ones go"—mirror the film's themes of moving past a lonely, stagnant existence by finding a singular, albeit unconventional, connection.
The summary misses the nuance that 'The Right One' (Den rätte) in Swedish is masculine/gender-neutral, hinting at the plot point that Eli is biologically male (a castrated boy), which adds another layer to the 'Right One' vs 'Right Girl' distinction.
The title Let the Right One In (2008) holds a dual significance: literally referring to the vampire folklore rule that a vampire must be invited into a private home, and metaphorically referring to the emotional risk of trusting another person. While no character speaks the title as a phrase, the concept is central to the plot. In a key scene, Oskar refuses to invite Eli in to test the rule; when Eli enters anyway, she begins to bleed profusely from her eyes, ears, and pores until Oskar shouts, "You can come in!" ("Du får komma in!"). The title is derived from the Morrissey song "Let the Right One Slip In," reflecting the themes of isolation and unconventional connection.