A 52-year-old Irish woman named Vanessa Carvin arrives alone on a small island off the west coast of Ireland, fleeing the ruins of her former life. She reinvents herself: she adopts the name Willow Hale, using her maiden and middle names, and shaves her blonde hair to a grey crop. The austere cottage she has rented has no television, no Wi-Fi, and a single bed. She removes the batteries from the radio and buries them in the garden, determined to escape the public commentary that consumed the previous year, when she and her husband Brendan were widely condemned. The nature of Brendan's crimes is not yet clear, but Vanessa notes bitterly that he is still technically her husband and that she would welcome news of his death.
She texts her younger daughter, Rebecca, 24, to say she has arrived. Rebecca reads the message, begins typing, then stops and blocks her mother, a pattern she repeats regularly. Vanessa places a photograph of herself with Rebecca and her elder daughter, Emma, on the table, reflecting that there will be no more photographs of Emma.
Over the following weeks, Vanessa settles into a routine of cliff walks, obsessive phone-checking, and trips to the village. She uses the island's two pubs strategically: the newer one, run by Tim Devlin, for lunch, and the older one for evening drinks. She meets Fr Ifechi Onkin, a young Nigerian-born Catholic priest who welcomes her warmly, and declines his invitation to services. At night, she catalogs her losses: a dead daughter, a husband in prison, a destroyed reputation.
Her nearest neighbor, Mrs Duggan, bursts into the cottage to reclaim her cat, Bananas, whom Vanessa has been feeding. Mrs Duggan married at sixteen and has eight children, all of whom moved away except Luke, the youngest, whom she keeps on the farm to work. She mentions Evan Keogh, a talented teenage footballer whose father Charlie is pushing him toward a professional career in England despite Evan's resistance.
Through reflections, Vanessa recounts her marriage to Brendan, who headed the National Swimming Federation, the governing body for competitive swimming in Ireland. Their first daughter, Emma, was an easy baby, but Brendan showed disappointment at not having a son. Rebecca, born two years later, was difficult from the start; only Emma could soothe her. This bond deepened throughout their childhood. Vanessa questions whether she was already inattentive to Emma's needs, too consumed by social status to truly see her daughter.
A visit to the island church triggers memories of Brendan's trial at the Four Courts in Dublin, where his associates testified they knew nothing of his behavior. Vanessa recalls the questions directed at her during her own interrogation, all designed to shift blame onto her. In the church, she notices Evan emerging from the confessional and sees Tim in a pew, visibly distraught.
One night, Vanessa ventures to the beach, wades into the sea, and submerges herself, contemplating whether to stay beneath the water as Emma did. Her body forces her back to the surface. Days later, Luke Duggan, Mrs Duggan's 25-year-old son, comes to apologize for having seen her walking back naked from the beach. He is gentle and lonely. They share whiskey, and the conversation turns intimate. When Luke says he should leave, Vanessa walks toward the bedroom. He follows and closes the door.
The events leading to Emma's death emerge gradually. Shortly after turning 14, Emma asked for a lock on her bedroom door, saying her father woke her when he came home late. A horrible suspicion crossed Vanessa's mind, but she pushed it away and refused the request. Around the same time, Brendan unexpectedly took a sabbatical from the Federation. Vanessa encountered Peggy Hartman, the wife of a director at a sister sports organization, who made distraught remarks implying knowledge of troubling rumors about Brendan, warning that women's silence enables men's misconduct. Brendan dismissed Peggy as someone with an alcohol addiction. Vanessa accepted this without further questions.
Brendan suggested a family trip to Wexford. During the stay, he received a mysterious phone call and proposed cutting the holiday short. The next morning, Rebecca woke her parents to say Emma was missing. Two Gardaí (Irish police officers) arrived at the hotel. Before they spoke, Vanessa already knew: Emma had drowned.
Tim Devlin eventually reveals he has known Vanessa's true identity since she arrived, having recognized her from coverage of Brendan's case. He shares his own story: he killed his wife in a drunk-driving accident and served six years in prison. When he frames himself as someone who never grew up, Vanessa refuses to offer absolution, sharply rebuking the self-pity of men who excuse their failures by claiming they still feel like teenage boys.
Tensions around Evan surface when he takes his father's boat and disappears. His mother Maggie confides that Evan has run away because he is frightened, revealing she has not left the island in eight years because her husband will not allow it. A search party brings Evan back bearing a fresh black eye.
During a general election campaign event, a politician named Jack Sharkey, the Minister for Tourism, Culture, Arts, the Gaeltacht (an Irish-speaking region), Sport and Media, visits the island. Vanessa has known Jack for years; he helped push for Brendan's appointment. A young voter named Lucy Wood, a survivor of sexual abuse, challenges Jack about his past support for Brendan. Jack then recognizes Vanessa in the audience. She silently begs him not to identify her. He resumes without naming her but condemns not only abusers but their enablers, directing his gaze at Vanessa.
Through flashback, Vanessa recounts Brendan's arrest at their home in Terenure, a Dublin suburb, on suspicion of sexually abusing a minor. By the time the case reached court, eight complainants had come forward. That evening, Rebecca said a single word, "Emma," raising the possibility that Brendan had abused their own daughter. Vanessa screamed at Rebecca, refusing to believe it.
During a storm, Brendan calls from prison. Vanessa tells him calmly that he raped their daughter and that Emma killed herself because of it. She tells him she wants him to die in prison. She texts Rebecca about the call; Rebecca replies: "There is no such person." Vanessa later discovers Bananas dead from exposure in the storm and weeps for the cat.
Rebecca arrives at the cottage unannounced. Vanessa decides to sell the family house, which is in her name alone, and split the proceeds with Rebecca. They agree to direct Brendan's share to support survivors of abuse. Vanessa confesses she came to the island to determine whether she was complicit and still cannot answer. Rebecca then makes her own confession: the night before Emma died, Emma told Rebecca what their father had been doing, warning her so she would be protected. Rebecca called Emma a liar, threw her out of the room, and locked the door. In the morning, Emma was gone. When Vanessa composes herself, she finds Rebecca has cut her hair short to match hers and has changed her surname from Carvin to Hale. They press their foreheads together, sensing Emma's presence between them, at the beginning of peace.
Vanessa leaves the island after roughly a year. Luke drives her to the dock, and Ifechi waits to say goodbye. Just before the boat departs, Evan comes running with his mother behind him. Maggie presses money into his hand, embraces him, and urges him to go without looking back. On the boat, Evan reveals he has always known Vanessa's identity and advises her to start fresh somewhere new; the first thing he will do in England is change his name. As the mainland approaches, Vanessa resolves to call this the end of the first half of her life. When they dock, Evan reaches to help with her suitcase. She waves him off, telling him she can do it herself.