In the summer of 1981, Cáit, portrayed by Catherine Clinch, is a nine-year-old girl growing up in a rural Irish household that is both impoverished and neglectful. Among many siblings, she finds herself struggling to fit in at school, experiencing a moment of humiliation when milk spills on her lap. With her mother expecting another child, the family decides to send this quiet girl away to live with her middle-aged cousin, Eibhlín Cinnsealach, played by Carrie Crowley, and her husband Seán, depicted by Andrew Bennett.
Upon arriving at the Cinnsealach home, Cáit is warmly welcomed by Eibhlín, who shower her with affection and teaches her the day-to-day chores involved in running the household and the farm. Eibhlín introduces Cáit to a deep well on the property, cautioning her about the dangers of fetching water from it. Initially, Cáit finds herself in a spare bedroom and experiences fear about the presence of adults nearby, leading her to have an accident in bed. Since Cáit's luggage was left behind, Eibhlín dresses her in boys' clothes from the wardrobe, but later goes out to purchase a set of new girls' clothes for her.
Seán, however, is initially distant and cold toward Cáit. One day, while Eibhlín is away, Cáit accompanies Seán to clean the milking parlour. As he engrosses himself in his tasks, Cáit wanders off, prompting a panicked search when Seán realizes she's missing. After he finds her, he scolds her, which frightens Cáit into running back to the house. Following this incident, Seán starts to regret his reaction and gradually attempts to connect with Cáit. He invites her to fetch the mail, transforming it into a joyful ritual and praising her speed, which leads her to open up and form a bond with him.
A significant event occurs when the Cinnsealach family attends a wake. In Cáit's restless state, a neighbor offers to look after her, and after a moment of hesitation, Eibhlín consents. During their walk, the neighbor divulges the tragic past of the Cinnsealachs, revealing that they lost a young son to drowning in their slurry pit before Cáit's arrival. When Cáit returns and shares this information, she unwittingly stirs up emotions in Eibhlín and Seán, who are visibly affected but do not contradict the neighbor's tale.
As Cáit's stay at the Cinnsealach home stretches over a month, her mother gives birth and expresses a desire for Cáit to return in time for the new school year. Each member of the Cinnsealach family feels a profound sadness about this impending separation. In an impulsive moment, Cáit sneaks off to fetch water from the well but tragically falls in, overwhelmed by her greatly filled bucket. Eibhlín, panic-stricken upon realizing Cáit's absence, finds her shivering and soaked, comforting her during this distressing episode.
Days later, Eibhlín and Seán take Cáit back to her parents. Upon her return, her mother hardly acknowledges her, and her father berates her for sneezing. After a strained conversation among the adults, Eibhlín extends an invitation for Cáit to return to them anytime, parting ways with heavy hearts.
As she watches the car drive down the long driveway, the gravity of the moment sinks in for Cáit, who suddenly breaks into a sprint toward the vehicle, managing to reach them just as Seán is closing the gate. They share a heartfelt embrace, while Eibhlín quietly sobs in the car. Caught between her conflicting emotions, Cáit gazes over Seán's shoulder and glimpses her father's angry approach, calling out "Daddy" as she closes her eyes again in an attempt to retreat from the tumult of her reality.
