Chiwetel Ejiofor stars as a disgraced doctor-turned-immigrant cab driver who inadvertently stumbles upon London's black market organ trade. Audrey Tatou and Sophie Okonedo also star as fellow "illegals" struggling to make ends meet in the shadows of England. This film is about illegal immigrants, it is told from their perspective, and because of that it becomes so humane that it indulges in social commentary. It's a really interesting, sometimes thrilling, watch.