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From epic landscapes and unforgettable culture, to the often trying times that come with international travel, Departures chronicles the unforgettable friendships, personal successes and sometimes crushing disappointments that befall travellers Scott Wilson and Justin Lukach on their journey. Departures is as much about the journey as it is the destination.

Sue Perkins embarks on a life-changing, 3,000-mile journey up the Mekong, South East Asia's greatest river, exploring lives and landscapes on the point of dramatic change.

Millions of tourists visit Angkor Wat in Cambodia every year to marvel at its remarkable architecture, yet most are probably unaware that when it was built nearly 1,000 years ago it was even more impressive. Using remote sensing technology, scientists now know what is hidden beneath the nearby paddy fields and jungle: a sophisticated metropolis with an elaborate network of houses, canals, boulevards and temples covering 30 square kilometres that housed three-quarters of a million people. To put that into perspective, London at that time was home to just 18,000. These previously hidden finds tell us a great deal about life during the golden age of the powerful Khmer dynasty.

UN human rights lawyer Morten Topsøe is sent to Cambodia to catch war criminals. He falls in love with a woman who, at the age of 15, was an executioner during the Khmer Rouge reign of terror. Ultimately, Topsøe finds himself torn between the fight for justice and the protection of his loved one.