I'm currently reading "The Complete Collection of Sherlock Holmes" by Sir Arthur Conan Doyle. Great read and not only does the element of mystery appeal to me quite a bit, but the glance into the background of the criminals is rather interesting, as are the changes you see in Watson's character. Sherlock's wit is also incredibly amusing to read, and Holmes is an admirable character, to me at least.
I'm also reading "The Arabian Nights" by numerous authors. I won't refer to it as a book, cuz it isn't, its a collection. From what I've read its very interesting though. The stories may be a little far-fetched in nature, with mythical ideas and stuff, but they make for a fascinating read and it gives a wonderful glimpse into the Arabian culture, especially in today's fairly homogeneous world.