The author of the book that Let Me In is based on has gone on record saying that he is very pleased with the American version. He had this to say: "I might just be the luckiest writer alive. To have not only one, but two excellent versions of my debut novel done for the screen feels unreal. Let the Right One In is a great Swedish movie. Let Me In is a great American movie. There are notable similarities and the spirit of Tomas Alfredson is present. But Let Me In puts the emotional pressure in different places and stands firmly on its own legs. Like the Swedish movie it made me cry, but not at the same points. Let Me In is a dark and violent love story, a beautiful piece of cinema and a respectful rendering of my novel for which I am grateful. Again."
Let Me In is an adaptation of the Swedish novel: Let the Right One In. Director Matt Reeves also uses the Swedish movie adaptation of the same book as inspiration for several of the scenes and shots seen in Let Me In.