Award-winning photographer Lisa Kristine captured this haunting image of a young man caught in the vicious cycle of modern-day slavery. For as long as he can recall, he has been forced to work on the Lake Volta, Ghana. Terrified of his master he will not run away. Cruelty is all he knows.

Latest estimates from the International Labour Organization - the UN agency for the World of Work - show there are 21 million people in forced labour, generating US$ 150 billion in illegal profits across all continents. The three-year 50 for Freedom campaign launched on 20 October 2015, calls on governments to help end modern slavery.