Three years after Drug Enforcement Administration undercover agent Robert Mazur completed his infiltration of Pablo Escobar’s Medellín drug cartel, he assumes a new undercover identity—and a brand-new sting.

Three years after Drug Enforcement Administration undercover agent Robert Mazur completed his infiltration of Pablo Escobar’s Medellín drug cartel, he assumes a new undercover identity—and a brand-new sting.