Sean Dunagan went to Monterrey, Mexico, to crack down on drugs. As an intelligence analyst for the Drug Enforcement Administration, he wanted to bring down the cartels and other trafficking organizations. He brought his family with him because Monterrey seemed like a peaceful, vibrant place to live. But things changed.

Sean saw that the drug war he was fighting was actually fueling more and more violence, creating the same kind of nasty black market that existed under Prohibition.