Now attached to French intelligence, Romane is training hard with agent El Malik and Delph, a genetically modified Dolphin with extraordinary mental abilities. Their goal: to infiltrate Algapower, the company at the heart of their investigation, and to find clues about its true purpose - in particular the mysterious Mermaid Project. What is the aim of Algapower's genetic research? Time is running short for Romane and her team.