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What happened in the final days of Gabby Petito's life? In this gripping true-crime series, her loved ones reveal the untold story of her tragic murder.

In the ruggedness of the American West, death is always a shadow over the shoulder: a grizzly bear encounter, an avalanche, or a bite from a rattlesnake can change everything in an instant; and those are just the natural threats; if one wants to get away with murder, the mountain ranges of the West may be the perfect place to do it; peering into the dusty files found in the back country sheriff's offices and highlighting the cases that were deemed unsolvable because the crime scene was too rugged, too remote, or the victim assumed too hard to find; despite the odds in this landscape, justice prevails.

Hunting Mr Nice tells the story of Howard Marks, who grew up in a Welsh village, dabbled in dealing weed while at Oxford university, before building a worldwide drug-smuggling empire and even working for MI6, at the height of the America's War on Drugs. For decades, the audacious and charismatic 'Mr Nice' managed to evade prosecution before his luck finally ran out, serving time in high security US prisons before ultimately writing a bestselling book and campaigning for the decriminalisation of marijuana.  This new insight tells the definitive story of the world's most notorious cannabis smuggler - and the police who devoted their lives to bringing him to justice, along with members of his criminal inner circle breaking their silence for the very first time. Also featuring journalists, lawyers and Marks' friends, the series takes us inside the cultural phenomenon of 'Mr Nice' to ask how he was able to become so criminally famous yet continue to evade justice.

This intense drama follows a federal prosecutor working undercover to bring down an immense organized crime ring.