Book excerpt: Intelligence challenges in the digital age : Cloaks, daggers, and tweets -- The education crisis : How fictional spies are shaping public opinion and intelligence policy -- American intelligence history at a glance-from fake bakeries to armed drones -- Intelligence basics : Knowns and unknowns -- Why analysis is so hard : The seven deadly biases -- Counterintelligence : To catch a spy -- Covert action - "a hard business of agonizing choices" -- Congressional oversight : Eyes on spies -- Intelligence isn't just for governments anymore : Nuclear sleuthing in a Google earth world -- Decoding cyber threats.