ITV’s ‘Betrayal’ Unveils a Gripping Espionage Thriller: Shaun Evans and Zahra Ahmadi Lead Tense Spy Drama

By Elena Vasquez London, February 11, 2026 – ITV has launched a compelling new four-part espionage series that dives deep into the shadowy world of British intelligence, personal loyalties, and the high personal cost of secrecy. Titled Betrayal, the drama premiered on February 8 on ITV1 and ITVX, quickly captivating audiences with its blend of high-stakes intrigue and emotional depth. Starring Shaun Evans as the beleaguered MI5 officer John Hughes and Zahra Ahmadi as the sharp intelligence operative Mehreen Askari-Evans, the series explores trust, betrayal, and the blurred lines between duty and personal life.

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ITV viewers say same thing minutes into new spy thriller Betrayal with Shaun Evans | Wales Online

Written by acclaimed playwright David Eldridge and directed by Julian Jarrold, Betrayal centers on John Hughes (Evans), a mid-career MI5 veteran whose instincts have kept him effective in the post-war-on-terror era. However, his unorthodox methods and a complicated personal life—including a strained marriage to Claire Wardly (Romola Garai)—have caught up with him. The plot ignites when John arranges a clandestine meeting with a British-Iranian informant promising crucial intelligence on an imminent terrorist threat, possibly linked to Iranian military interests. The encounter turns deadly: the informant is assassinated, and John kills the attacker in self-defense. Instead of commendation, he faces internal investigation and potential redundancy.

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Like Slow Horses but darker: Betrayal is the “exceptionally-written” ITV spy thriller to rival the very best – Yahoo Life UK

Enter Mehreen Askari-Evans (Ahmadi), a British-Iranian MI6 agent parachuted in to take over the case. Initially positioned as John’s superior and potential replacement, she becomes an unexpected ally as they uncover layers of conspiracy involving gangland violence, institutional pressures, and global threats. Their partnership intensifies the drama, raising questions about loyalty—both professional and personal—while John’s efforts to salvage his marriage grow increasingly fraught amid the secrecy demanded by his job.

The supporting cast adds rich texture: Nikki Amuka-Bird portrays Simone Grant, John’s no-nonsense MI5 handler; Gamba Cole and Omid Djalili contribute to the ensemble, bringing nuance to the web of alliances and suspicions. Produced by Mammoth Screen with executive producers including Eldridge, Evans himself, Jarrold, Tom Leggett, and Damien Timmer, the series draws comparisons to Slow Horses but with a darker, more downbeat tone that emphasizes psychological realism over flashy action.

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Betrayal – official trailer (ITV)

Critics have offered mixed but engaged responses. The Guardian described it as “drab and downbeat,” likening it more to a crime drama than traditional espionage fare, yet praised Evans for infusing John with “bewildered vulnerability.” The Independent called it “pure ITV nonsense” in parts but acknowledged Evans’ likeable lead performance and the intriguing premise of a maverick spy squeezed out of the agency. Viewers have echoed this divide: some hail Evans’ “phenomenal” portrayal and the “exceptionally-written” script, while others note pacing issues or perceived blunders in logistics. On social platforms, fans debate the twists, particularly around Mehreen’s true allegiances—revealed in the finale as a complex MI6 operation unbeknownst to MI5.

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Beyond Paradise star Zahra Ahmadi’s ‘tough choice’ before role in ITV’s Betrayal | Wales Online

Filmed across London and Manchester, Betrayal grounds its thriller elements in relatable human struggles: the toll of secrecy on relationships, the paranoia of institutional scrutiny, and the moral ambiguities of modern intelligence work. Evans, best known for Endeavour, brings intensity and nuance to a character who’s far from glamorous—more ordinary operative than James Bond. Ahmadi, seen in Beyond Paradise and The Bay, delivers a layered performance as Mehreen, balancing professional competence with personal stakes in a story touching on cultural and national identities.

With all episodes now streaming on ITVX, the series has sparked conversations about trust in an era of shifting loyalties. As one viewer put it: “Who can you trust when the people closest might be the greatest threat?” Betrayal doesn’t shy from that question, delivering suspense through character-driven drama rather than gadgets and chases. Whether it fully rivals genre heavyweights remains debated, but its focus on emotional authenticity and strong performances from Evans and Ahmadi ensures it stands out in ITV’s lineup.

In a television landscape hungry for intelligent thrillers, Betrayal reminds us that the real dangers often lurk not in foreign shadows, but in the fractures of everyday trust. As the fog of conspiracy clears in the final revelations, viewers are left pondering the personal betrayals that cut deepest.

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