Ivan Koubek, a 22-year-old chess prodigy, arrives at a small-town arts centre in Leitrim for a chess exhibition. While standing alone in the corner watching the chess club men arrange furniture, he meets Margaret, a 36-year-old staff member at the arts centre, who mistakenly expected the chess prodigy to be a child. Her embarrassment breaks the ice and they share an easy rapport. Ivan is immediately drawn to her, finding her attractive and feeling an involuntary urge to hold her attention, even awkwardly interrupting her conversation with Ollie, the chess club captain, to ask if she plays chess.

The exhibition begins and Ivan plays ten simultaneous games. Margaret slips in to watch partway through, observing Ivan's tall, intense figure as he methodically defeats each opponent, including a young girl and finally Ollie himself, achieving a clean sweep. After the games, Ivan tenderly coaches the young girl on her mistake. Margaret congratulates him, and they share a sense of quiet connection. She offers to drive him to his accommodation as planned. The group first goes to the Cobweb Bar for drinks, where Margaret and Ivan sit together. Their conversation turns personal—she asks what he's passionate about, and the word hangs between them with charged significance. Ivan stares at her openly while she tries to ignore the growing awareness of his attention.

Margaret drives Ivan to his holiday cottage in silence. When they arrive, he invites her inside. Despite her awareness of the age gap, her professional position, and her complicated life—she is technically still married—Margaret accepts. Inside the cold, damp bungalow, they talk. Ivan confesses his social awkwardness and his regret over devoting his life to chess at the expense of relationships. Margaret shares that she is separated from her husband and understands the anguish of wondering about paths not taken. She tells Ivan he is attractive and that women will fall in love with him. He asks to kiss her, and she says yes.

They sleep together. Ivan is nervous but earnest, and the encounter is brief but emotionally intense for both. Afterward, Ivan feels overwhelmed with happiness and protectiveness. Margaret tells him it was beautiful. In the morning, Margaret wakes alone in bed, initially thinking Ivan has left, but discovers he was only in the shower. She asks him not to tell anyone at work about what happened. Before she drives him to his workshop, Ivan asks to give her his phone number, saying she can contact him if she ever thinks about him. She accepts the number but warns she may not call. After dropping him off, Margaret sits in her car feeling unmoored—her ordinary life has slipped free of its structure, and the encounter with Ivan, though strange and unexpected, carries a meaning she cannot yet define.