The curtain rises on the climactic episode as Huw is escorted to the police station, still draped in Paul's crimson stain, his fingerprints meticulously recorded before he is transformed into a somber figure clad in a grey prison tracksuit. Jenny and her partner, Martin, confront Huw with a series of images: first, the briefcase bearing his initials, which stuns him into silence, and subsequently, the cufflink discovered beneath Ruth's bed. Dawn breaks on the realization that Patrick has orchestrated a sinister setup, casting Huw as the scapegoat in a grim replay of past atrocities, using him just as Declan had once been used.
Back in their neighborhood, Paul's residence stands as a stark crime scene, its sorrow echoed by the transformed atmosphere at Alice and Huw's home. As the ambulance carts away Paul's lifeless body, Liz stands witness, her sorrow twisted into fury when Margot extends a condolence, only to be met with the startling revelation that neighbors actually suspect her father of Paul's murder.
Inside the police station, Huw is haunted by the playback of his voicemail to Ruth, the words now distorting into a confession in his ears. He confides in Jenny, confessing his regretful past with Ruth but insisting his apology was never meant as an admission of her murder. The officers meticulously revisit each piece of evidence, the tension rising with Huw's growing agitation. The climax comes when they present the murder weapon—Paul's killer's knife, eerily familiar as the one missing from Alice and Huw's kitchen. Patrick's cunning is laid bare; he must have slyly pilfered it from their home.
Huw's panic mounts, his mind racing with the belief that Margot and Alice are in imminent peril. Martin, unyielding, denies Huw's plea to leave. In a burst of desperation, Huw's shouts escalate, compelling officers to restrain him, while Jenny watches helplessly, caught between duty and empathy.
Elsewhere, Patrick engages in a sinister ritual, incinerating photographs of his victims within the confines of his workshop, ensuring no shred of evidence ties him to his dark deeds.
Jenny confides in Martin her lingering doubts about Huw's guilt, asserting that if he were indeed the murderer, he wouldn't have dared to call Ruth afterward. Martin counters by suggesting that Huw's actions stem from a mental breakdown, rendering him oblivious to his deeds. Seeking fresh air, Jenny encounters Alice at the station's reception, where she awaits Huw. Alice endeavors to reason with Jenny, who apologizes but insists on adhering strictly to procedure. As Jenny exits, Alice persists, trailing her into the office and confronting Huw's former colleagues. With passion, Alice reminds them of Huw's unwavering support and scorns their current treatment of him.
In his cell, Huw frantically pounds on the door, pleading for anyone to heed his warnings of his family's peril and his desperate need to contact his wife. He shouts that while he languishes behind bars, Patrick roams free, unchecked. However, his cries fall on deaf ears, echoing down an abandoned hallway.
Elsewhere, Margot returns home to witness Patrick consoling Tina through the window. As she gazes, he catches her stare. Meanwhile, Alice arrives at her doorstep only to be confronted by Patrick, who mocks her plight, wondering how it feels to have her husband incarcerated with no recourse. Alice, summoning courage, confronts him, wondering if he derives pleasure from psychological manipulation or the actual act of murder. He feigns ignorance and questions her choice in Huw, prompting her to rush inside and slam the door in his face.
The following morning, Jenny arrives to escort Huw to another interview. En route, he points out the inadequacy of the evidence against him, especially the cufflinks, which he never wears. Jenny rebuffs discussion until they reach the interview room, prompting Huw to commend Martin's decency but question his detective skills, contrasting him favorably with Jenny's proficiency.
Determined to extract a confession from Huw, Martin sets out to interview him, unaware that Margot, desperate to expose Patrick's true identity, has broken into his workshop. Inside, her eyes fall upon half-burnt Polaroids and a Polaroid camera, fueling her quest for evidence. As she delves deeper, Patrick unexpectedly enters, catching her red-handed.
Terrified, Margot quickly feigns distress, claiming she had come seeking help to free her father from jail. Patrick, though clearly skeptical, plays along, inquiring about Huw while casually mentioning that he photographs his 'clients,' snapping Margot's picture without her consent. He probes into how she gained entry and whether Alice knows of her whereabouts, with Margot lying through gritted teeth. Patrick's chilling remark that "the camera never lies" alerts Margot to his intent to eliminate her. She dashes through the shop, only to find it securely locked, trapping her within.
Patrick, contemplating murder but wary of the taxi receipt linking Margot to his workshop, decides instead to make her disappear without a trace. However, his contemplation is interrupted by Jenny's arrival at the shop, finding it impeccably secured and plunged in darkness. Unable to see inside, Jenny calls out, prompting Patrick to silence Margot – but her screamed plea for help sends him fleeing out the back. Pursuing him, Jenny is intercepted by Patrick, who threatens her with a knife, commanding her to lie prone until he escapes. Compelled by fear, Jenny complies, and once he's vanished, she rises cautiously.
Later, Jenny secures Huw's release on bail, to which he expresses profound gratitude for saving Margot's life. Yet, Jenny is furious that she didn't catch a glimpse of Patrick's face and allowed him to slip away. Huw reasoned that obeying Patrick was a matter of survival, which doesn't ease Jenny's frustration. During their ride home, Jenny inquiries about Patrick's possible hiding spots, to which Huw suggests he wouldn't have ventured far.
Returning home, Alice and Margot embrace Huw warmly, their reunion a moment of relief amidst turmoil. However, with Patrick still at large, their ordeal remains far from resolution.
Huw visits Tina, and amidst sincere apologies for mistakenly branding him the killer, Steve confesses that their acquaintance with Patrick amounted to mere minutes, whereas they've known Huw for years, ought to have known better. Huw dismisses their contrition, highlighting Patrick's genius for manipulation. Tina emerges from the house, prompting Huw to express his condolences over Paul's demise, to which she responds with bewilderment about Paul's motive for entering Patrick's abode.
Back at their residence, Huw reprimands himself for Paul's fate, while Alice offers comforting reassurances. However, she is taken aback when Huw reveals that Patrick had confided in Steve about an upcoming holiday, interpreting it as a subtle threat of his impending return, signaling that the ordeal is far from concluded.
At Patrick's house, Jenny informs Huw that neither the premises nor the workshop yields any evidence tying him to the stalking incident. Huw insists on Patrick's cunning and remains convinced of his imminent reappearance. Martin, attempting to reconcile by extending a handshake, is left hanging as Huw turns away, ignoring his gesture.
After attending Ruth's funeral, Huw is visibly disturbed. Upon returning home, he is horrified to discover the Polaroid of Margot, snapped by Patrick at the workshop, tacked to their fireplace. Alice and Margot, petrified, urge him to contact the authorities. Huw, however, asserts that they would be indifferent, insisting that he alone can apprehend Patrick. Alice, incredulous that Huw insists on playing the hero, is irked when he suggests she and Margot relocate, to an undisclosed location, until the ordeal subsides.
Reluctantly bidding farewell, Alice and Margot depart, Alice pleading with her husband to exercise caution as they leave. Once they've vanished from sight, Huw assembles an assortment of screwdrivers and a menacing cricket bat, then waits with bated breath for Patrick's return.
In the dead of night, Huw jerks awake on the sofa as his phone rings, displaying an unfamiliar number. It's Patrick, casually suggesting a spontaneous visit, akin to popping by for a casual coffee. Huw's curt response, "Come and get me," hangs in the air.
Perched upstairs, Huw keeps watch on Patrick's house, eyes glued to the darkened windows until a light flickers to life, signaling Patrick's return. The phone jingles again, and Patrick's taunting voice fills the receiver, while Huw struggles in vain to exit his front door, only to find it locked against him. Desperate calls to Jenny go unanswered as eerie music begins to echo from upstairs, leading Huw to believe Patrick is lurking above. But just as he shouts down the stairs, warning Patrick not to ascend, Patrick materializes behind him, wielding the cricket bat with lethal force. The blow sends Huw's phone skittering across the floor as he dashes to the sanctuary of the basement.
Patrick descends the stairs with deliberate slowness, finding Huw awaiting him in the heart of the basement. Huw warns him of impending doom, insisting they'll both be there until the police arrive. But Patrick counters, pointing out Huw's own imprisonment, and brandishing a knife with sinister intent.
Meanwhile, Jenny notices Huw's missed call and dials him back, only to hear silence as his phone lies abandoned in the kitchen. She tries Alice next, inquiring after Huw, but Alice, already in hiding at a hotel, prompts Jenny to hang up abruptly, wary of divulging the unfolding drama. Realizing Huw is in peril, Jenny bolts from the police station, racing towards his house.
Down in Huw's basement, Patrick maintains his knife at Huw's throat, engaging him in a psychological tug-of-war. Huw stalls, hoping to buy Jenny time, as Patrick toys with him, vowing to murder Huw before vanishing and returning to harm Alice. Huw expresses pity for Patrick, noting his apparent ignorance of love.
The cat-and-mouse chase reaches its climax as the police arrive on the scene, with Jenny bursting into the basement at precisely the moment when Patrick plunges a knife into Huw's chest. The officers swiftly overpower Patrick, who is then handcuffed. Alice returns home, her heart racing with dread, only to witness Patrick, drenched in blood, being escorted to a police car. The sight fills her with horror, and she immediately realizes that Huw has been harmed.
Descending into the basement, Alice finds Jenny desperately attempting to stem the flow of blood from Huw's stab wound. She gently takes over from Jenny, who simultaneously dials for an ambulance. While they await the emergency responders, Huw whispers to Alice that it is all over, that he has finally captured the killer he has tirelessly hunted for years, and that they can now embark on a normal life together. He excitedly suggests a trip to Lisbon at Easter and begins sketching out plans, but Alice, determined to keep him conscious, reassures him that help is on its way.
Though Huw's fate remains uncertain, there is a glimmer of hope that he might survive this final confrontation with Patrick. Meanwhile, the neighbors stand in stunned silence as Patrick sits in the police car, his gaze fixed blankly ahead. After so many years of evading Huw, the Ripton Stalker has finally been brought to justice.
