Phoebe: Are there a lot of spies in this country today?

Scott: Far more than people can probably even imagine. You can't rule anybody out. You never know what it is that motivates people to do this.

For 17 years, Ana Montes was quietly sharing information with the Cuban government while working as a U.S. defense intelligence analyst.

Scott Carmichael’s book is True Believer: Inside the Investigation and Capture of Ana Montes, Cuba's Master Spy. Jim Popkin’s book is Code Name Blue Wren – The True Story of America’s Most Dangerous Female Spy and the Sister She Betrayed.

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