Two years have passed since the events of Mermaid Project. The world continues to suffer from the effects of climate change and economic upheaval, and Romane and Brahim have paid the price for their courage and integrity. Ignored, even censored, by their superiors, they’re now reduced to taking lousy private-eye jobs to earn a living. Meanwhile, the same cetaceans whose advanced intelligence the UN had dismissed are now attacking fishing trawlers… with rockets! Before long, the authorities are forced to give our two investigators their old jobs back…

Paris, end of the 21st century. Inspector Romane Pennac is the only white woman in her station. The world has suffered devastating wars and ecological disasters, and the old powers of Europe and America are now the third world. Amidst it all, it is to this young woman, now a member of a discriminated-against minority, that a couple of devastated parents turn. A mysterious letter has just announced that the body of their daughter, recently deceased in New York, is missing from her coffin…