It is America's most powerful police force–made up of an elite team of Special Agents secretly patrolling the nation–and the world. While its patriotic mission is public knowledge, the FBI's tactics are classified. We'll go undercover to reveal the secret training, special operations and state-of-the-art tools used in today's 21st century crime fighting. How far can the FBI go to prevent crime and protect Americans? What are ghost agents, and how are they used for undercover surveillance? Who is the most notorious double agent? How has the internet changed the way the FBI works? While its global reach and sophisticated technology helps keep America safe, the FBI's greatest strength is its ability to keep its crime fighting tactics secret…until now.