A Pulitzer Prize winning investigative journalist’s journey into a billon-dollar secret industry that is shaping our world – the booming business of private spying, operatives-for-hire retained by companies, political parties  and the powerful to dig up dirt on their enemies and, if need be, destroy them. For decades, private eyes from Allan Pinkerton, who formed the first detective agency in the U.S., to Jules Kroll, who transformed the investigations business by giving it a