John Corey and Asad Khalil have both lived hard-knock lives. As revealed in Nelson DeMille’s monster bestseller Plum Island, the gruff, wisecracking NYPD homicide cop Corey stopped a hail of bullets–but he couldn’t stop his wife from walking out on him. Asad, raised under Muammar Qaddafi’s eye after his dad’s murder, lost his surviving family