Molly Windsor plays Ruth, who is dropped off at a caravan park in Cornwall to live with her boyfriend Joseph Quinn as Tom, who works there. She quickly meets the park staff: Lisa Palfrey as Shirley, the park manager, and Theo Barklem Biggs as Kai, the diligent maintenance assistant. Tom is visibly pleased that his girlfriend has arrived, and Ruth senses a murmur of unease beneath the surface of their easygoing routine.
The next morning, Tom goes to work and asks Ruth to speak with Shirley about a job, a practical step that could stabilize their living arrangement. Instead, Ruth cleans the caravan, discovering red lipstick on the mirror and strands of long red hair in Tom’s clothes. Her curiosity grows when she takes the clothes to the laundry and sees Tom in conversation with a red-haired girl. Ruth tries to follow him, but he vanishes, leaving behind a strand of red hair tangled on a wooden beam. She continues with the laundry, accidentally spills her money, and, flustered, is helped by Jade, a Stefanie Martini as Jade who works at the caravan site.
Later, Ruth and Tom share a dinner where friction surfaces about communication and Ruth’s job prospects. Ruth asks Tom if he knows a girl with red hair; he refuses to answer. They dance, a tentative moment of closeness that is shaded by the lipstick on the mirror and Ruth’s growing sense that something is off. The tension peaks when Tom is surprised but eventually embraces Ruth after she bites him in a moment of emotional intensity.
The following day Shirley hires Ruth to work in the caravans, emphasizing that the sea can be a great healer—an idea Ruth clings to despite her fear of water. Ruth accepts the job, and on the walk home she’s aggressively approached by a German Shepherd before Kai steps in to restrain the dog. Ruth asks Kai about Tom’s whereabouts; Kai says he’s out surfing, a detail that adds to Ruth’s growing unease about her partner.
Back at Tom’s, Ruth confronts him about where he was, and he says he finished Kai’s workload. Ruth tells Tom that Shirley has given her the job, which pleases him, yet the air between them remains tense and unsettled.
At work, Ruth meets Jade again, along with a young girl named Kippa, the latter played by Elodie Wilton as Kippa. Ruth and Jade begin to form a subtle bond as they work together, with Ruth also receiving a manicure from Jade. Ruth’s night ends with a failed attempt to seduce Tom; he rebuffs her advance, and she feels a growing ache of loneliness. In the moment, Ruth removes her nails and becomes acutely aware of something unsettling in the room.
The next day, Ruth learns the neighbor’s name—April. Tom explains that April is Ruth’s neighbor, and while Ruth asks more about Jade’s reputation, Tom is reluctant to elaborate. Ruth finds a brown furry jacket while at work, adores the way she looks in the mirror wearing it, and carries that small, private moment of confidence with her.
Later, Ruth and Kippa go swimming with Ruth learning to trust the sea a little more as Kippa coaches her. They return to land, and Ruth heads to the public showers, where a moaning noise from the next stall unsettles her. Ruth shares the experience with Tom, who scolds her for swimming despite her fear, while Kai defends her independence, further fueling Tom’s ire. Tom’s fixation on Jade becomes more evident when Ruth notices a wall decorated with nude pictures, hinting at a troubling undertone she can feel but cannot yet name. The nerves in Ruth’s hands sharpen in a moment of distress as she glances toward Jade, who remains a distant, tantalizing figure.
Back at Jade’s space, Ruth and Jade talk about their relationships, but Jade remains elusive. Ruth and Jade share a moment of closeness and almost kiss, but Ruth’s fear and confusion win out, sending her out into a heavy downpour.
That night Ruth mentions seeing the red-haired girl to Shirley, who denies that any caravans are accessible, claiming they’ve all been sealed. The lack of concrete answers only intensifies Ruth’s sense that something is hidden behind the park’s façade. Ruth decides to help with a search for April, who has gone missing, joining a trek with Jade, and they quickly realize the search party has its own undercurrents.
Ruth sneaks into a caravan with lights on, hoping to find clues, and inside she glimpses the red-haired girl, a moment that deepens the mystery. She races to the public showers to confirm what she saw, finding a wet swimsuit and a flashback of two women having sex, one with large nails that bleed—an image that gnaws at Ruth and amplifies the sense that she’s entangled in something larger than a simple love triangle.
In the daylight, April is found at the beach with Jade hinting that April’s condition is dementia. Ruth’s sense of belonging continues to fracture; she remains drawn to Jade, even as Tom’s suspicions and fear for Ruth grow.
The days pass with Ruth becoming more distant from Tom. Tom, watching the events unfold on television, hears the sound of a fox and looks toward Jade’s quiet caravan, which sits mostly dark. Ruth notices the tension and grows increasingly uneasy, sensing an atmosphere of suppressed truths that threaten to overwhelm her.
One morning, Ruth walks into the rough sea, determined to test her limits. In a haunting sequence, she drowns into the water and reemerges, exhausted, and frightened. The moment is intertwined with a vision of the red-haired girl, suggesting a spiritual or imaginative guide that connects Ruth to Jade in a way neither fully understands. Jade supports Ruth afterwards, offering warmth and a shield against the mounting pressure.
Tom and Kai’s conflict erupts in a heated confrontation that ends with Ruth being locked in Tom’s caravan. She weeps, haunted by Jade’s presence and the sense that her relationship with Tom is dissolving. Ruth secretly observes Jade’s nails being done earlier in the day, a memory that lingers as a silent, mutual attraction between them mounts. Ruth breaks out of Tom’s caravan with a determined resolve, stealing the spare key and donning the brown fur coat and a red wig, preparing herself for a new kind of appearance and identity.
At the bonfire beach party, Ruth makes a dramatic entrance in her charged disguise, and the crowd watches as she walks to find Jade. When Jade appears, the two share a charged, unspoken recognition. Ruth takes Jade to a secluded spot, and they kiss passionately as Jade reciprocates. The two make love as Ruth’s wig and coat are shed, revealing a lighter, more open version of herself before they fall asleep together, Jade sleeping with Ruth by her side.
The final morning arrives with Ruth standing in the sea again, but this time with a calm confidence that suggests a new balance. Jade watches from the shore, a quiet beacon of support in Ruth’s transformed state. Ruth smiles into the horizon, the water around her now a place of quiet strength rather than fear, and the last image lingers on her, serene and resolute, as Jade looks on from the beach.
