Elena and Vara believe they are leaving their home in Moldova, one of the poorest countries in Europe, for a better life in London. However they soon realise that they have in fact been sold to traffickers and are being taken to the dark and seedy side of the capital to work as sex slaves.

Daniel Appleton (Simm) is a researcher and investigator for London-based charity, Speak For Freedom, investigating the plight of girls sold into sexual slavery. A chance meeting with Elena changes Daniel's life forever as he uncovers a potentially explosive corruption scandal involving Kernwell, a private US contractor supplying troops to the international peacekeeping mission in Bosnia.

When the girls' story reaches Madeleine Harlsburgh (Wendy Crewson), the wife of Kernwell's chief, she starts to suspect that Kernwell employees may themselves be trafficking women. As she seeks out the truth, she finds herself forced to choose between her husband's reputation and her family's happiness.

The interweaving strands of this story combine in a single explosive narrative that exposes the shocking and all too real network of sex trafficking.

Winner of 8 BAFTAs including Best Drama Serial and Best Actress for Anamaria Marinca.