In a small coastal town, the lives of its inhabitants are disrupted when a series of mysterious disappearances begins to plague the community. The plot follows Alma, a young marine biologist, who returns home after years of studying in the city, only to find her childhood friend Lucas deeply affected by the disappearance of his sister. Alma is drawn into the investigation, and together with Lucas, they discover that the events are connected to an ancient local myth about a sea creature that, according to legend, emerges every hundred years to claim what it considers its own.
As they delve deeper into the legend, the two friends uncover a dark secret that has been hidden in the town for generations. With the help of an old sailor, they begin to unravel the history of their community and confront their own fears and traumas. Tension mounts as the disappearances escalate, and they realize that time is running out. With an immersive visual style, the film combines the eerie atmosphere of the ocean with the characters' internal struggles. Amidst the search, Alma and Lucas must confront not only the creature of the legend but also their own demons, leading the story to a shocking climax that explores family ties, loss, and the desire for redemption.