At a moment when British television is rethinking how espionage stories are told, ITV is betting that the most dangerous conflicts no longer unfold only in safe houses or interrogation rooms, but inside marriages, offices and institutional politics. That wager arrives this weekend with Betrayal, a four-part MI5 drama that premieres on Sunday, February 8, at 9pm, positioning domestic fallout—not foreign adversaries—as its central threat.
The series launches with an aggressive rollout. Episodes one and two will air on consecutive nights, Sunday and Monday, replacing After the Flood in the schedule, while the full box set becomes immediately available on ITVX following the first broadcast. The strategy signals confidence that audiences will want to move quickly through a story built on momentum, suspicion and moral uncertainty.
At the centre of Betrayal is John Hughes, played by Shaun Evans, a long-serving MI5 officer who no longer feels aligned with the “progressive” intelligence service he works for. The show opens with a professional gamble that detonates both his career and his private life. Acting on instinct rather than protocol, Hughes arranges a clandestine meeting with a British Iranian informant connected to the Stockport criminal underworld, who claims to have intelligence about an imminent terrorist plot on UK soil.
The meeting collapses into violence. Before the informant can pass on what he knows, he is assassinated. Hughes kills the gunman in self-defence, a split-second act that triggers scrutiny rather than praise. Instead of being protected, he becomes the subject of an internal investigation led by his superior, Simone Grant, portrayed by Nikki Amuka-Bird. From that moment, Betrayal frames MI5 less as a monolithic shield and more as a pressure cooker, where loyalty and liability are separated by fine margins.
Espionage, marriage and the cost of secrecy
The professional fallout runs in parallel with a domestic reckoning. Hughes’ wife, Claire, played by Romola Garai, has reached the limits of what she can tolerate from a life structured around omissions and half-truths. As the investigation tightens and Hughes refuses to disengage from the case, the strain on their marriage becomes inseparable from the security crisis itself. The series repeatedly asks whether secrecy in service of the state inevitably corrodes intimacy at home.
Complicating matters further is Mehreen Askari-Evans, an intelligence operative played by Zahra Ahmadi, who is assigned to take over Hughes’ role. As they work together, Hughes grows convinced that a hardline faction within the Iranian regime is connected to the suspected plot. At the same time, he becomes increasingly uneasy that the real danger may not lie overseas at all, but within the system he serves. The question driving the series is blunt: can he identify the true target and prevent a major attack before his isolation—professional and personal—becomes irreversible?
Betrayal is written by playwright David Eldridge and directed by Julian Jarrold, a BAFTA and Emmy nominee. Their approach favours psychological consequence over spectacle, grounding national-security stakes in individual choices. That focus is reinforced by an ensemble cast that includes Gamba Cole, Omid Djalili, Matthew Tennyson, Hayley Tamaddon, Anthony Flanagan and Paddy Rowan, alongside Evans, Garai, Amuka-Bird and Ahmadi. Notably, Evans and Rowan are both Liverpool natives, a detail that fed into the show’s production geography.
Although the drama is set primarily in Manchester, much of it was filmed in Liverpool, with camera crews working on Rumford Street in June 2025 and staging a key sequence at Bootle Strand. The locations are not treated as anonymous backdrops. Instead, the series leans into recognisable urban spaces to counterbalance the abstraction often associated with intelligence dramas.
Evans has spoken about the personal significance of filming in his home city, noting that his family is based there and describing the experience as unusually meaningful. He highlighted the crew’s energy and the rare access to parts of Liverpool he had not previously seen, calling the shoot a special period in his life. Ahmadi, who has spent considerable time working in Manchester, echoed the sentiment from a different angle. Having visited Liverpool only once before, she said the production revealed the city’s architecture, musical heritage and food scene to her, reshaping her understanding of the place.
Those details underscore what Betrayal is attempting to do differently. Rather than treating espionage as an abstract contest of intelligence agencies, the series anchors its story in lived environments and relationships. Simone Grant embodies the institutional pressures of leadership within MI5, while Claire Hughes represents the human cost of constant concealment. Mehreen Askari-Evans, meanwhile, introduces a counterpoint to Hughes’ instincts, challenging his assumptions even as she becomes entangled in his unresolved case.
As Betrayal arrives on ITV and ITVX, it enters a crowded field of spy dramas but distinguishes itself by shifting the centre of gravity away from gadgets and geopolitics. Its premise suggests that the most destabilising betrayals are not always ideological, but emotional—and that the line between protecting the country and destroying one’s own life is thinner than intelligence officers are trained to admit.
Whether viewers choose to watch weekly or consume the entire series in one sitting, the show’s release marks ITV’s latest attempt to recalibrate the modern spy thriller for an audience increasingly sceptical of clean heroes and clear enemies. In Betrayal, trust is scarce, motives are opaque, and the damage, once done, is permanent.