Former marine John "Falcon" Chapman, a dark anti-hero driven by guilt and suffering from post-traumatic stress disorder, who will destroy himself unless given something else to destroy - a useful weapon-of-last-resort for the U.S. State Department. When Chapman';s sister is brutally attacked while on assignment in Brazil, Chapman flies into Sao Paulo to track down her assailants, quickly entering the city';s seedy underbelly and discovering a world of drugs, the sex trade, corrupt cops, and organized crime syndicates battling for control..