Ria (Gabrielle Creevy), a young woman drifting through life in a sleepy Welsh coastal town, exists on the margins—until she takes a job cleaning the lavish home of Fran (Eve Myles), a charismatic and sophisticated novelist. Fran is everything Ria isn’t: confident, wealthy, and utterly self-possessed. Intoxicated by Fran’s glamour and magnetic attention, Ria eagerly soaks up her mentorship. Fran, in turn, seems rejuvenated by Ria’s malleable admiration, encouraging her to shed her meekness and seize control of her destiny. An intensely close, almost obsessive friendship blossoms between the two women, built on shared confessions and a mutual sense of rescue.

But this transformative relationship curdles into something dark and co-dependent when Fran’s radical advice leads to a catastrophic event. Suddenly bound by a terrible secret, their dynamic shifts into a high-stakes, psychological game of cat and mouse. As paranoia sets in and the police circle, the line between protector and predator, mentor and manipulator, becomes terrifyingly blurred. In a story of twisted sisterhood and the price of reinvention, everyone is a guest in someone else’s life, and overstaying your welcome can be deadly.

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The Guest Full cast list

1. Gabrielle Creevy as Ria

Ria’s transformation is the unsettling core of the series. Creevy masterfully charts her journey from an invisible, downtrodden cleaner to a confident woman emboldened by Fran’s influence, and finally into a fraught accomplice whose loyalty is tested by terror. Her desperation for a better life is so palpable it becomes her tragic flaw, making her willing to follow Fran down any dark path for a taste of the belonging she’s always craved.

Creevy (In My Skin) uses her expressive eyes and physicality to convey volumes without words. The subtle shift in her posture—from a defensive slouch to an empowered stride—mirrors her internal change, making her eventual regression into fear all the more heartbreaking to watch.

2. Eve Myles as Fran

Fran is a sphinx-like figure of enigmatic charm and calculated vulnerability. Myles crafts a mesmerizing performance where every generous gesture and piece of life advice feels both genuinely nurturing and potentially manipulative. Her need for control and adoration is the engine of the drama, and her backstory as a writer who specializes in crafting perfect narratives hints at her ability to reshape reality itself.

Myles (Keeping Faith, Torchwood) imbues Fran with a chilling ambiguity. Is she a benevolent savior, a malevolent puppeteer, or a deeply lonely woman whose help has disastrous consequences? Myles keeps the audience guessing until the very end, making Fran one of the most compelling and unpredictable characters on television.

3. Kimberley Nixon as Eleri

Eleri, Fran’s oldest and most suspicious friend, represents the life Fran left behind. Nixon brings a sharp, wary energy to the role, seeing through Ria’s new facade and recognizing the unhealthy dynamic long before anyone else. She is the voice of reason that goes unheeded, her growing concern for Fran curdling into outright hostility towards the interloper she blames for the chaos.

Nixon’s (Fresh Meat) performance adds a crucial layer of external pressure. Her character’s investigations and confrontations force both Fran and Ria to make riskier moves, accelerating the inevitable collapse of their carefully constructed world.

4. Sion Daniel Young as Lee

Lee is Ria’s kind but simple boyfriend, content with their modest life and bewildered by her sudden transformation. Young portrays him with a gentle, grounded authenticity that makes him the story’s emotional anchor. His confusion and hurt as Ria pulls away from him into Fran’s orbit provides the series with its most relatable heartbreak.

Young (The Tourist, Stay Close) makes Lee more than just a foil; he is the symbol of the life Ria is so desperate to escape. His steadfastness highlights the tragedy of her choices, as she abandons something real for something glittering and toxic.

5. Amy Beth Hayes as DS Alex Flynn

DS Flynn is the tenacious detective who senses that the official story of the “shocking event” doesn’t add up. Hayes plays her with a cool, observant detachment, cutting through the middle-class politeness of Fran’s world with direct, unsettling questions. She is the embodiment of the consequences that are slowly closing in.

Hayes’s performance is a masterclass in quiet authority. Her character’s methodical investigation provides the narrative tension, as her evidence board slowly and inevitably begins to connect the two women at the center of the storm.

6. Joseph Ollman as Mike Rice

Mike is Fran’s long-suffering publisher and ex-lover, who is both professionally and emotionally entangled with her. Ollman brings a weary cynicism to the role, representing the collateral damage of Fran’s manipulative past. He sees Ria not as a person, but as the latest in a long line of Fran’s “projects” destined to end in disaster.

Ollman’s character provides crucial exposition about Fran’s history, suggesting a pattern of behavior that makes the current crisis feel inevitable. His warnings to Ria, though self-interested, carry the weight of painful experience.

7. Samuel Creasey as Gwesyn

Gwesyn is a local oddball and amateur photographer who accidentally captures key evidence on his camera. Creasey creates a uniquely quirky and nervous character, whose desire to be part of the drama makes him an unpredictable wild card. He is drawn to the mystery surrounding the two women, unaware of how dangerous his curiosity could be.

Creasey’s performance adds a touch of unsettling local color. Gwesyn’s presence is a constant reminder that in a small town, there are no real secrets, only people who haven’t pieced the information together yet.

8. Trish Williams as Retirement Party Goer

In a small but memorable role, Williams provides a moment of stark, mundane reality that contrasts with the heightened drama of the main plot. As a reveler at a party, her character’s simple, unguarded conversation with Ria briefly illuminates the normal world Ria has sacrificed, grounding the thriller elements in genuine pathos.

Williams, a beloved Welsh actress, brings authenticity and a sense of place to her scene, reminding the audience of the tight-knit community that forms the backdrop to this intimate story of betrayal.