: Collider’s Comparison and GradeSaver’s Study Guide detail significant changes between the novel and the Swedish ( Let the Right One In ) and American ( Let Me In ) films, such as the darkening of the "protector" role and the ambiguity of Eli's gender identity.
: Critics at 746 Books discuss how the vampire myth serves as a metaphor for human isolation, particularly focusing on the "lost boys" of a Swedish suburb and the failure of adult authority figures.
: The essay The Role That Identity Plays argues that the story is less about horror and more a coming-of-age love story that tackles adolescence, bullying, and sexual uncertainty.