Story of British spies ~ MI5 in particular ~ from one who livedthrough it. Wright was the first scientist to join MI5, the domesticspy-catchers, and led the way for others. The bulk of the book is taken up with the search for the Fifth Man ~ Wright's candidate is Roger Hollis, who was head of MI5 during the early Sixties ~ a well-hidden Soviet mole like Philby and his ilk. Reading it, at times, it appears that Wright considers himself responsible for every innovation in spy technology during the '50s and '60s, but if you can get over his view of himself, the book becomes a fascinating read, on a par with anything Le Carré wrote. As far as the Fifth Man goes, my mind is still open, but Wright gives excellent cause to suspect that Hollis probably was at least bent, if not broken.