Today, 27 million men, women and children are held, sold and trafficked as slaves throughout the world. In Slavery: A 21st Century Evil, Rageh Omaar embarks on a worldwide journey to uncover the truth about the flourishing 21st century slave trade. Episode by episode, his investigation will expose the brutal reality of modern slavery and unpick the reasons why this age-old evil persists.

Slavery: A 21st Century Evil : Food chain slaves

It is a nation built on the abolition of slavery, but there are at least 40,000 slaves in the US today. In the opening episode of Slavery: A 21st Century Evil, Al Jazeera's Rageh Omaar investigates food chain slavery in the US.

Slavery: A 21st Century Evil : Sex slaves

There are an estimated 1.4 million sex slaves in the world today and international trafficking is on the rise. 25 minutes

Slavery: A 21st Century Evil : Bonded slaves

It is a form of slavery that is passed down from one generation to the next, enslaving millions. 25 minutes

Slavery: A 21st Century Evil : Child slaves

There are at least 8.4 million child slaves in the world today, many of them held as forced labour. 25 minutes

Slavery: A 21st Century Evil : Charcoal slaves

Poverty-stricken men from the north of Brazil are often lured to remote camps where they are used as slave labour. 25 minutes

Slavery: A 21st Century Evil : Bridal slaves

In the midst of widespread poverty, fueled by economic inequality and rampant corruption, a new form of slavery - bridal slavery - has flourished in India. Women and young girls are sold for as little as $120 to men who often abuse them. 24 minutes

Slavery: A 21st Century Evil : Prison slaves

Over the past 20 years China has become the world's biggest exporter of consumer goods. But behind this apparent success story is a dark secret - millions of men and women locked up in prisons and forced into intensive manual labour. 25 minutes.