Betrayal follows John Hughes (Shaun Evans), a mid-career MI5 officer grappling with a rapidly changing security landscape and his own personal demons. When John’s clandestine encounter with a potential British-Iranian informant ends in bloodshed, he comes under scrutiny from superiors including Simone Grant (Nikki Amuka-Bird). As John navigates the murky world of espionage, the strain on his marriage to GP Claire (Romola Garai) becomes increasingly unsustainable.

Tensions escalate further with the arrival of Mehreen Askari-Evans (Zahra Ahmadi), a sharp, ambitious operative who has recently transferred from MI6, challenging both his professional standing and emotional control.

Betrayal is written by award-winning playwright and screenwriter David Eldridge, directed by Julian Jarrold  (A Very Royal Scandal, This England) and produced by Irma Inniss (Mr Loverman, The Bay)