The bluefin tuna, a prized and endangered marine species, is at the center of a high-stakes battle for survival. As the global demand for sushi drives a multi-billion euro industry, environmentalists and industry insiders clash over the future of this iconic fish. Through a network of informants and scientific research, the documentary exposes the dark side of industrial fishing, revealing how illegal practices and opaque supply chains threaten to push the bluefin tuna to the brink of extinction.