Jo Cooper leads an uneventful life, selling jewellery on a Greenwich market stall and trying not to pay attention to the noises made by the S&M devotees who live next door. An ex-drug-addict herself, she has a penchant for rescuing people, which gets her in trouble when she helps a frightened girl escape from some Russian thugs. The mysterious woman overturns Jo's life, plunging her into the world of illegal immigration and prostitution, where human lives are ruthlessly traded, and violence and distrust are rife.