The discovery of an audiovisual archive brings to light traces of a marine biologist who mysteriously vanished in the Po Delta. Through footage, photographs, documents, and an encounter with a peculiar local girl, the research she was conducting on the blue crab comes to light—a scientific investigation that gradually transforms into a reflection on change, adaptation, and the fragile boundary between the human and the animal. What if her disappearance was the result of the very research she had undertaken?