theres a book called "the bedside book of murder" which i love, it tells you about 50 different murders that have happened over the years, including some that are slightly less well known and i find it really interesting. i ended up borrowing it off my step-mum years ago and just never gave it back, and pages are starting to fall out a bit as i have read it alot over the years. it may also give you an idea of which crimes to look into further, though it often results in me getting extremely worried looks when im sat reading it on the bus/train, especially if i have my ipod on, as i have a tendency to sing to the music in my head without realising im doing it, which obviously no-one hears me doing so i probably look a little crazy while doing this.lol. it does stop annoying people sitting next to me and trying to talk to me though, which can be a good thing.