The famed—some would say notorious—author of Trainspotting and many other brilliant offenses against common literary decency comes at last to America, with a dark and twisted tale of personal training and abject codependency in the fading glitter of Miami's South Beach, with a novel that asks the provocative question: Why would you want to be "the Biggest Loser" anyway?      When Lucy Brennan, a Miami Beach personal-fitness trainer, disarms an apparently crazed gunman chasing two frightened homeless men along a deserted causeway at night, the police and the breaking-news cameras are not far behind. Within hours, Lucy becomes a hero. Her celebrity is short-lived, though: the "crazed gunman," turns out to be a victim of child sexual abuse and the two men are serial pedophiles.
