The tropical island of Mauritius is home to Melrose maximum security prison, where 800 of the country's worst drug smugglers, sex offenders and murderers are locked up. Every convict is watched day and night and even the smallest infraction is met with extreme punishment.

Cooking shows turned the humble garlic bulb into something that's essential to cuisines and into a multi-billion-dollar crop. Every year, humans consume nearly 50 billion pounds of garlic, and most of it comes from one country: China. But a lawsuit raises troubling questions about suppliers.

'Mormon Lost Boys' Young men have been thrown out of their homes because of an edict allowing polygamist church elders to monopolize young girls. 'The Fat Farms of Mauritania' In the West African country of Mauritania, parents send their daughters to rural fattening camps. 'Mumbai Slumscraper' A visit to Mumbai, where slums sit below billion-dollar, single-family skyscrapers.

The fourth episode starts off with the two riding through Santa Cruz, Argentina. The plan is to cross over into Chile and then going up into the Andes. Ewan and Charley head through Argentina’s red rock landscape while a member of their team copes with altitude sickness. The duo are well and truly underway and the first signs of all are well is how well the Harleys hold up in challenging conditions. The roads alternate between unforgiving and pleasant and these e-bikes push through effortlessly. As they ride through Chilean Andes, the audience is shown a picturesque view of the beauty of the countryside, an experience which Boorman calls 'magical.'

With increasing rumours of a pending arrest intensified, the Bhagwan flees the ranch. The two Learjets carrying Rajneesh and ten of his followers lands at the Charlotte airport, where U.S. police were waiting for them. The United States Marshals Service arrests Rajneesh. Almost simultaneously, Sheela and several followers are also arrested in Germany. In a federal court in Portland, Bhagwan Shree Rajneesh pleads guilty to immigration fraud charges and agrees to leave the country. The Bhagwan's devotees -- and his enemies -- reflect on his legacy.

Lesotho's Maseru Central Correctional Institute in Southern Africa holds the country's most dangerous and disturbed criminals. Shockingly almost half the inmates are doing time for rape. The culture of sexual violence in Lesotho has deep roots in society. Women are taken as secondary citizens in their culture. And sexual aggression continues inside the prison.
In this episode, Raphael Rowe will spend a week locked up in this African prison surrounded by sex offenders.