For years their familiar story was of two siblings who took different paths out of South Boston: William "Billy" Bulger, former president of the Massachusetts State Senate; and his brother James "Whitey" Bulger, a vicious criminal who became the FBI's second most-wanted man after Osama Bin Laden. While Billy cavorted with the state's blue bloods to become a powerful political force, Whitey blazed a murderous trail to the top rung of organized crime. Now, in this compelling narrative, Carr uncovers a sinister world of FBI turncoats, alliances between various branches of organized crime, St. Patrick's Day shenanigans, political infighting, and the complex relationship between two brothers who were at one time kings.