A couple, Roland and Vanessa, travel to a picturesque, quiet seaside town in France during the 1970s. Roland, an American writer struggling with a creative block, hopes the tranquil setting will inspire him, while Vanessa is grappling with depression and personal issues. As they settle into their idyllic surroundings, it becomes evident that their marriage is strained. Roland spends his days drinking at a local café, attempting to write but often finding himself distracted. Vanessa, on the other hand, isolates herself in their hotel room, emotionally distant and disconnected from her husband.

Their routine shifts when they become intrigued by a young, newlywed couple staying in the adjacent room. Through the discovery of a small peep hole in their wall, Roland and Vanessa start spying on the duo's intimate moments, which stirs a range of emotions and reflections on their own relationship. Their voyeuristic habits become an unhealthy fixation, and as tensions rise, they are compelled to confront the deep-seated issues plaguing their marriage. The interaction with their new acquaintances and the serene yet haunting backdrop of the seaside provoke a journey through their anguish, desires, and lingering feelings for each other.