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When British TV producer Mark Henderson took time off work to travel around South America in 2003, his adventure holiday turned into 101 days of terrifying captivity when he and seven other backpackers were taken hostage while trekking in the Colombian jungle.

His group had trekked its way to an ancient archaelogical site deep in the Sierra Nevada de Santa Marta mountain range.

While they were asleep, a group of men burst into their hut, and forced them to walk even deeper into the mountains at gunpoint. The armed men initially said they were paramilitaries and had come to protect them.

One of the group, Matthew Scott, managed to escape and survived for eleven days in the jungle before being found and brought to safety by some indigenous people.

Mark and the rest of the group were then told that they had been kidnapped and were hostages.

After three weeks the kidnappers finally revealed their true identity, saying they represented the ELN - the National Liberation Army, a dangerous and violent left wing guerrilla group.

They told the hostages they had seized them to raise awareness of human rights violations by the paramilitaries and the army in the area.

For the next three months Mark and the other hostages were made to walk for five or six days at a time through the jungle to keep ahead of the army that was trying to find them.

They were finally released on 22 December 2003 after being held for more than three months.

Once he had been released Mark tried to readjust to his life back in England but continued to be haunted by what had happened to him.

And then something extraordinary happened - Mark received an email from one of his kidnappers, who called himself Antonio.

They began to exchange emails and agreed to make a documentary about the kidnap. It was Mark's way of finding answers to the trauma he had been put through.

Five years later, once he had secured the funding, Mark and three other hostages returned to Colombia to make the film.

As well as revisiting the place where they were kidnapped, he and a German hostage, Reini, went to meet Antonio and his girlfriend who had by then made a new life in another country.

When they met Antonio, Mark and Reini were determined to finally find out why they had been kidnapped.

Durnig their meeting Antonio tried to explain why he had done what he had done - and apologised to Mark and Reini for the suffering he had caused them.

As for Mark, he says he has found real closure by going back to meet his kidnapper.

Mark Henderson told Outlook's Lucy Ash his remarkable story.