In 2006, fresh out of the D.E.A. Academy, Andrew Hogan heads west to Arizona, where his adventures unknowingly placing him on the trail of Joaquín "El Chapo" Guzmán, the leader of the Sinaloa Cartel and Public Enemy No. 1 in the United States. Six years later, as head of the D.E.A.'s Sinaloa Cartel desk in Mexico City, Hogan finds his life and Chapo's are ironically, on parallel paths: they're both obsessed with the details. Here Hogan recounts how he was able to achieve the seemingly impossible, from infiltrating El Chapo's inner circle to leading a white-knuckle manhunt with an elite brigade of Mexican Marines—racing through the cartel's stronghold to bring the elusive kingpin to justice.