The Book Behind the Bombshell By ROMESH RATNESAR In the abstruse world of espionage, it's not always easy to know when you are in on a secret. So when intelligence sources approached New York Times reporter James Risen in late 2004 with evidence that the Bush Administration was running a covert domestic-spying program, Risen says he "wasn't sure what to believe." As Risen and Times colleague Eric Lichtblau looked into the story, more whistle-blowers came forward, convincing the reporters that the eavesdropping claims were credible. At that point Risen asked a few "very senior" government officials what they knew about...