Double Deal: The Inside Story of Murder, Unbridled Corruption, and the Cop Who Was a Mobster by Michael J. Corbitt and Sam Giancana (the nephew). This was a really well written and interesting book about a corrupt cop working for the Chicago Outfit. Goes into detail about rackets and figures that don't get covered very often such as Hy Larner and his machines. There are a few tall tales that left me a bit skeptical, but overall I would definitely recommend it.