The City & The City by China Mieville. "I like my science fiction 'light.' I'm generally not interested in aliens, space exploration, crazy futuristic technology (dinner in the shape of a pill - no thanks!) Although I can cite books that I've loved with these elements, I just don't gravitate to them naturally. The City & The City has just the right mix for me, taking a traditional crime novel plot and executing it in a fantasy setting. Plot-wise the story is fairly standard - a young woman is found murdered and our hero, Tyador Borlu of the Extreme Crime Squad, is assigned to the case. The complexity of the setting is what makes this book so engrossing."