One of my interests is Japanese noir, though I occasionally find these novels tough going due to the sometime inscrutability of Japanese culture. To help make these things more scrutable, I try to mix in a few nonfiction works on Japan, and I have just read a really great one: Mark D. West's Law in Everyday Japan: Sex, Sumo, Suicide, Statutes (2005). Using methods largely from economics, West examines the intersections between laws and social norms as they affect Japanese culture in seven areas, including the management of sumo wresting and the handling of karaoke noise complaints. Probably the most noirish chapters are those dealing with love hotels and debt-suicides. Academic but highly accessible. Witty, too.