I intended to see this vampire flick in the theaters but never got around to it. It's the American remake of the Swedish film, "Let the Right One In," and as remakes go I'd say they did a wonderful job. The director (Matt Reeves, "Cloverfield") was clearly a fan of the original, trying to capture the signature loneliness and desperation but giving it enough changes to make it his own.
Essentially, "Let Me In" is kind of an anti-Twilight. There's nothing glamorous about this young vampire, played by Chloe Moretz (famous for her role as Hitgirl in "Kick-Ass"). When Abby and her murderous assistant take up residence in a filthy apartment next door to Owen (played by Kodi Smit-McPhee of "The Road") the two tweens form a bond which at first seems like young romance and later seems entirely more sinister.
The film is rather dark and dirty, lending a sense of realism to a world of fantasy. Virtually everyone in the movie is shown in some sympathetic light, even the school bully who regularly torments Owen. The movie is bloody and violent but seems almost elegant in its delivery. A one sentence synopsis: Harry Potter collides with "The Texas Chainsaw Massacre."
Definitely worth a rental.