This is the untold story of the American federal agent who captured the world's most wanted drug lord.

Every generation has its larger-than-life criminal legend living beyond the reach of the law: Billy the Kid, Al Capone, Ronnie Biggs, Pablo Escobar. But for every one of these criminals, there's a Wyatt Earp, Pat Garrett or Slipper of the Yard. For Joaquín Archivaldo Guzmán-Loera, aka 'El Chapo' - the 21st century's most notorious criminal - that man is DEA Special Agent Cole Merrell.

This is the incredible story of Merrell's seven-year-long chase to capture El Chapo, a multibillionaire drug lord and escape artist posing as a Mexican Robin Hood who, in reality, was a brutal sociopath responsible for the murders of thousands. His greedy campaign to take over his rivals' territories resulted in an unprecedented war with a body count of over 100,000.

We follow Merrell on his quest to achieve the seemingly impossible: to cross the border into Mexico and arrest El Chapo, the leader of the Sinaloa Cartel, a billionaire and public enemy number one, who had been evading capture for more than a decade and had earned a reputation for being utterly untouchable.

This intimate thriller tells how Merrell single-mindedly and methodically climbed the ladder within the hierarchy of the Sinaloa Cartel - the world's wealthiest and most powerful drug-trafficking organization - by creating one of the most sophisticated undercover operations in the history of the DEA. From infiltrating Chapo's inner circle to leading a white-knuckle manhunt with an elite brigade of Mexican marines, Merrell left no stone unturned in his hunt for the world's most powerful drug kingpin.