Emma Banville, a human rights lawyer known for defending lost causes, sets out to prove the innocence of Kevin Russell, who was convicted for the murder of a school girl 14 years earlier.

Helen McCrory, Jonathan Forbes, Sam Swainsbury, Wunmi Mosaku, Rebecca Callard, Catherine Steadman, John Bishop, Rick Warden, Allan Corduner, Jemima Rooper, Michael Gambon, Jack Shepherd, Kika Markham, Douglas Reith