After viewing the film I decided that I would like to read the book that the film was based upon. I found this to be a good read and many areas had more depth than the film, as with any film version of a book often there is much that has to be left out. Some of the characters have greater roles in the book and the backgrounds are also explored especially Eli's and the guardian's. Overall the film Let the Right One In is a good interpretation of this book. My understanding is that the US remake Let Me In also follows the book quite closely but with a slight different emphasis in which ancillary characters were used, but having not seen this version I currently cannot comment.Overall a good read.
Haven't read the book, but seen both films. Let Me In is excellent, but differences are very slight and what is missing from Let The Right One In is very much missed, even if it doesn't make the boys life quite so claustrophobic (his father isn't in it at all).
The best part about the book is the various replicas of different props. I love them. The replicas look like the items looked in the movie, though for a few of them, I think they were just barely seen in the movie. They are all incredibly detailed. Most of them are in almost clear envelopes that are attached to the pages.