Riz Ahmed and Manjinder Virk play brother and sister Sohail and Nasima. Sohail is an ambitious law undergraduate who signs up with MI5 and, eager to play a part in protecting British security, begins an investigation into a terrorist cell. The enquiry soon leads him back to his community in Bradford where no one, not even his closest friends, are above suspicion. Unsure if he is being used by the establishment, he is soon forced to question where his loyalties really lie; with his family and friends or the country of his birth, Britain. His sister Nasima is a medical student in Leeds who becomes increasingly alienated and angered by Britain's foreign and domestic policy after witnessing at first hand the relentless targeting of her Muslim neighbours and peers. When her best-friend falls foul of the Government's anti-terror legislation Nasima is soon forced to confront her liberal views and, disillusioned by the political process, embarks on a dangerous path that finally takes her to a terrorist training camp in North West Pakistan. With action set in Pakistan, Eastern Europe, London and Leeds, the story is told in two parts with both feature-length episodes finally colliding in a gripping finale. Britz is an extraordinary thriller that ultimately asks whether the laws we think are making us safer, are actually putting us in greater danger.