Edna Pontellier is spending the summer at Grand Isle, a Creole resort off the Louisiana coast, with her husband Leonce, a New Orleans businessman who is kind in his way but regards her much as he regards his other comfortable possessions. Among the easy, openly affectionate Creole families she feels both drawn in and set apart, and a young man named Robert Lebrun attaches himself to her as a summer companion, devoted and half-teasing.
Slowly something shifts. Chopin calls it a light beginning to dawn within her, the first recognition of herself as an individual with an inner life of her own. The warm candor of her friend Adele Ratignolle loosens her habitual reserve, the voice of the sea works on her, and one moonlit night Edna at last learns to swim. The sudden mastery exhilarates her, she strikes out alone for open water, and is met by a flash of terror at the distance back to shore.
Robert, sensing the bond becoming serious, abruptly leaves for Mexico. Back in New Orleans Edna begins, quietly and then openly, to refuse the shape of her old life. She abandons her reception days, takes up her painting, listens to the fierce pianist Mademoiselle Reisz, who warns that the bird who would rise above tradition needs strong wings, and drifts into an affair with the practiced Alcee Arobin that stirs her body without touching what she most wants.
She moves out of her husband's grand house into a small place of her own that the servants call the pigeon house, paying her own way and answering to no one. When Robert returns he loves her but recoils from her freedom, speaking of her becoming his wife, of being given to him; she answers that she is no longer a possession to be handed over, that she gives herself where she chooses. Called away to a friend's bedside, she returns to find he has fled again, leaving a note that he loves her but is going.
Alone through a wakeful night, Edna sees clearly that no person and no role can hold the self she has uncovered, and that her children stand like small antagonists who would drag her back into a life not her own. She goes down to Grand Isle, to the empty beach and the sea that first spoke to her. She puts off her clothes, stands new-born under the open sky, and swims out, past memory and past fear, until her strength is gone and the shore is far behind.