It was a come-on, but in real life a flop. Sounded good in theory but when I hired the author to investigate a real subject, what he purported in his book wasn't done. I wonder if any of it is true or if it is only in the authors' James-Bond imagination.I tested the authors' assertions in a real life situation WITH HIM AS THE INVESTIGATOR. Not only did his "investigation" produce nothing, he was unable to justify WHY he was unable to produce any information, and which, if any, of the many techniques he espoused in his book, he used.His book makes for scintillating, make believe reading but don't buy it if you think it has anything to do with what any private investigator , especially the author, can do in the real world.