Book excerpt: Capturing one of the most outrageous stories of the Capone era, this is the twin biography of a couple who defined the extremes and excesses of the Prohibition Era in America. ";Machine Gun"; Jack McGurn, a babyfaced Sicilian immigrant and Al Capone's chief assassin, and Louise May Rolfe, a beautiful blonde dancer and libertine, paired to represent the epitome of fashion, rebellion, and wild abandon in a decade that shocked and roared. Detailing McGurn's suspected role in the St. Valentine's Day Massacre and his sensational alibi, this biography shows how the couple captured the headlines in every newspaper in the country, had their hipster speech copied by Hollywood, and were the spellbinding poster children of the new jazz subculture. More than a look at the joie de vivre of two lovers caught in history's spotlight, this work examines the continuing allure of the Roaring Twenties and the characters who inspired America's love affair with gangster literature and crime cinema.