In the bustling port city of Piraeus, Greece, Ilya is a free-spirited, self-employed prostitute who has cultivated a loyal group of regular clients whom she entertains during weekly Sunday gatherings — her designated day off from her business. Her adventurous nature is vividly showcased when, on a whim, she strips down to her underwear and plunges into the ocean near the shipyard, inviting many workers to join her swim. Among them is Tonio, a charming, half-Italian worker who quickly becomes enchanted by Ilya’s striking beauty and carefree attitude. Interested in her, Tonio learns that Ilya doesn’t set fixed prices and only engages with clients she genuinely likes, teasing Tonio about his chances to win her over that evening. Determined to become her exclusive, he resolutely aims to capture her heart.
Meanwhile, Homer Thrace, played by Jules Dassin, is an American scholar deeply immersed in classical Hellenic philosophy. He believes Ilya embodies a Greek cultural decline, which he attributes to the influence of Stoic and Epicurean philosophies that emphasize detachment and pleasure over understanding and moral virtue, as advocated by ancient philosophers like Socrates, Plato, and Aristotle. Homer views the pursuit of true happiness as rooted in the joy of knowledge; however, Ilya perceives life through her own unique lens, filtering out negativity and embracing a relentlessly optimistic outlook. Her perspective is vividly illustrated when she accompanies Homer to see a performance of Medea. Ilya interprets Medea as a nurturing mother and devoted wife, who cunningly seeks to rekindle her marriage, dismissing the tragedy and ruthlessness traditionally associated with her actions to take revenge.
Homer, however, finds Ilya’s buoyant worldview incomprehensible. He sees himself as a Pygmalion figure, believing it his moral duty to reshape Ilya into a more morally upright and content individual, seeing her as someone who could lead a better life if guided properly. Their connection becomes deeper when Noface, the mysterious owner of apartment houses where prostitutes work, considers Ilya a disruptive influence. Noface, whose identity remains hidden behind large sunglasses, is concerned about Ilya’s independence and her influence on the other prostitutes, especially Despo, who leads a strike demanding lower rents.
Despo approaches Ilya, urging her to encourage the other women to cease working as part of their protest. Recognizing their shared goal of undermining Noface’s control, Homer is funded by Noface to attempt an experiment: he proposes to Ilya that they spend two weeks together, with Homer paying her for her exclusive company, as he offers to teach her classical knowledge and culture in hopes of reforming her. Despo and the prostitutes see this as an opportunity, and when Homer’s plan begins, Ilya makes an effort to study the books and listen to records Homer provides — though she quickly grows bored, especially since she’d rather be out partying with sailors, especially when she hears the arrival of ships in the harbor.
As the two-week period concludes, Noface pays Homer for his work, but Despo, having seen the transaction, immediately informs Ilya about the scheme. Furious, Ilya leads a dramatic strike, throwing her and the other prostitutes’ bedding out of the windows and refusing to operate. The police arrest them, but the prostitutes’ fines are paid off by Noface's lawyer. In negotiations, Noface agrees to reduce the rents by half, aiming to dilute Ilya’s influence. Amidst these upheavals, Tonio and his friends arrive to escort Ilya to a local bar, where Homer’s attempt at cultural education has led to some humorous conflicts, such as him criticizing a guitar player for lacking the ability to read music.
Homer, never shy to voice his opinions, tells Ilya she’s beautiful but “dumb,” lamenting his failed attempt to “save” her. In a heartfelt moment, Tonio insists that Ilya is not just a symbol, but a genuine woman with her own desires and ambitions. Homer admits he wanted to make love to her but restrained himself, recognizing her autonomy. However, Tonio, with confident resolve, declares it’s “too late” for regrets, as he sweeps Ilya away to Italy for a new beginning — a gesture that deeply stirs her.
As Homer prepares to leave Piraeus, he boards a ship back to the United States, discarding his notes and reflections on his experiments with Ilya. The film closes on a poetic note, with a final scene that echoes the Greek farewell—“And they all go to the seashore!” — symbolizing both departure and the eternal connection to the sea, life’s endless horizon, and the pursuit of freedom and understanding.
