The premise is inherently enjoyable: watching a whip smart manipulator take on enormously powerful vested interests in what, for better of for worse, must now be known as the DC swamp of political lobbyists, and Chastain brings a suitably hard edge and opaque outwardness to the portrayal as her Elizabeth Sloane manoeuvers towards her endgame. Also good: seeing Mark Strong play a regular, decent human being (a first I think); plus Alison Pill.