Four Ep political drama from David Hare starring Carey Mulligan, John Simm and Billie Piper. A pizza man is killed on the doorstep of a London mansion block. He is shot twice from a distance by a professional killer. But why? Was he even the intended victim? Joanna Bobin plays Sarah across the series. Exciting new drama for Monday nights, BBC2 at 9pm. Watch the trailer here