John Walker was a Miami undercover narcotics agent in the 1970s. Ten years later, he was in prison for smuggling 12,000 pounds of marijuana. In prison, he connected with a South American drug lord who was still running the family operation from inside the federal pen. Within months of being paroled, John began smuggling again—this time uncut Colombian cocaine. And this time, he put everything on the line: his freedom, his family and, ultimately, his life.