Main cast •
Helen McCrory as Emma Banville, an experienced human rights lawyer •
Jonathan Forbes as Dominic Truelove, a former police officer and Banville's legal assistant •
Sam Swainsbury as Kevin Russell, a 37-year-old man who insists he was wrongly imprisoned for 14 years for the murder of Linda Simms •
Rebecca Callard as Annie Peterson, Kevin's former fiancée and the mother of his son •
Wunmi Mosaku as DCS Olivia Greenwood, a
Counter Terrorism Command officer who previously led the Simms murder investigation •
Robin Weigert as Heather Myles, a
Central Intelligence Agency operative •
John Bishop as Steve Livesey, Banville's photographer boyfriend •
Jamie Bamber as Matthew Wild MP, a young politician and former soldier who later becomes
Leader of the Opposition •
Emma Hamilton as Laura Wild, wife of Matthew Wild •
Michael Gambon as Sir Alastair McKinnon, the former Deputy
Secretary to the Cabinet under Prime Minister
Tony Blair.
Supporting cast •
Eve Austin as Linda Simms, the 15-year-old girl murdered in 2003 •
Rick Warden as Charlie Simms, father of Linda •
Cathy Murphy as Beth Simms, mother of Linda •
Ben Cartwright as Phil Simms, uncle of Linda •
Jack Hollington as Jason, the 14-year-old son of Kevin Russell and Annie Peterson •
Christine Bottomley as DS Jenna Brooks, a
Counter Terrorism Command officer •
Karima McAdams as Miriam Attar, Syrian wife of a suspected terrorist and friend of Banville •
Alec Newman as Tony Pullings, a photojournalist •
Allan Corduner as Monty Berman •
Jemima Rooper as Maggie Berman •
Brendan Patricks as DCI Nicholas Staines, a
Metropolitan Police Service detective •
Armin Karima as Imran •
Colin Stinton as Jack Kretchmer, the former US
Under Secretary of Defense under President
George W. Bush •
Catherine Steadman as Karen Buxton •
Dhaffer L'Abidine as Dr. Yusef Attar, one of Banville's clients suspected of having ties to
ISIS •
Tim McMullan as David Nolenn •
Pandora Clifford as Nicola Osborne •
Jack Shepherd as Arthur Banville, Emma's terminally ill father •
Kika Markham as Eleanor Banville, Emma's mother • James Thorne as Derek Peterson, Annie's husband and Jason's stepfather •
Sam Crane as Luke •
Sammy Winward as Siobhan Murphy •
Corey Johnson as Larry Arlman, an American
private investigator used by Banville and her colleagues •
Jonah Lotan as Logan Bradley, a member of the
United States Air Force ==Episodes==