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There are some essays at a site hpcompanion.com about the individual book plots. An interesting one concerns The Chamber of Secrets. The author makes the case that Ginny Weasley was not the target of choice for the diary merely the victim of Lucius' anger at Arthur in the book store. The essay lays out the theory that Lucius had planned Harry to get the diary and had been planning that probably for several months. I don't think I've read any fanfic exploring that plot.