It"s not surprising that a book on spying would be tinged with irony. Midway through this gripping but soberly written expose on the Cold War spy game, the author, a former KGB agent, recalls some advice he gave back in the 1990s to former National Security Advisor Brent Scowcroft, who wanted to know how Cherkashin was able to recruit CIA agents like Aldrich Ames and Robert Hanssen as KGB spies and whether it was possible to prevent treason. "The only way to be entirely safe is to remove people from intelligence gathering," Cherkashin offered-an intriguing comment given the recent renewed emphasis on human intelligence. But throughout the book, Cherkashin proves his point, showing just how porous these agencies are and how operatives deftly remain effective as spies for both sides. Recruited in 1985, Ames and Hanssen made the initial overtures to the KGB, and Cherkashin was there to receive them and their boilerplate motivations for wanting to cross over-money and a sort of renegade...