The real-life stories of America's undercover agents. What does it take to go deep undercover, spending extended periods of time in close quarters with the very people you are dedicated to putting behind bars? Could you live alongside some of the world's most dangerous criminals, knowing each day that one small slip up or piece of bad luck could see your cover blown and your life under threat? For the undercover operatives of America's law enforcement agencies, life in deep cover is a reality. These are some of their stories.