Bergman portrays "Karin," yearning to leave behind the difficulties following the war, and she finds herself drawn to a younger Italian man, "Antonio" (Mario Vitale), moving to his isolated home close to the volcano mentioned in the title. However, once there, she finds it difficult to adjust to the everyday realities of life, the predictable patterns, and the challenges inherent in her new surroundings—a village also grappling with the aftermath of war and noticeably lacking people. It becomes apparent that her husband isn't what she thought he would be; he’s rather rough around the edges. The question is, what happens next? My initial recommendation would be to view the original version with subtitles, if necessary, as it significantly enhances the film's sense of realism, and frankly, that’s the most compelling aspect. The story unfolds at a slow, unremarkable pace, mirroring the life she leads on her island. It feels like it takes an extended amount of time—far beyond the stated 90 minutes—to reach its conclusion. As you would anticipate from Rossellini, the film possesses a certain refinement, and the starkness of the volcanic landscape effectively establishes the overall tone; however, it’s primarily driven by dialogue and isn't particularly uplifting.

Source on TMDB