The slave trade was officially abolished throughout the British Empire in 1807. This documentary reveals one of Britain's darkest secrets: a form of slavery that continued well into the 20th century - the story of Indian indentured labour. "Coolies: How Britain Reinvented Slavery" tells the astonishing and controversial story of the systematic recruitment and migration of over a million Indians to all corners of the Empire. It is a chapter in colonial history that implicates figures at the very highest level of the British establishment and has defined the demographic shape of the modern world.