Nessa's security advisor follows a lead as he hunts down the missing boy. Meanwhile, her brother Ephra makes a startling discovery that could blow the family, and its work, apart.

Cast: Claire-Louise Cordwell, Maggie Gyllenhaal, Lubna Azabal, Katherine Parkinson, Andrew Buchan, Tobias Menzies, Suzann McLean, Stephen Rea, Janet McTeer, Rupert Frazer, Rebecca Clay, Celia Adams, Lindsay Duncan, John Mackay, Ben Adams, Igal Naor, Philip Arditti, Aymen Hamdouchi