Roger, Romane's brother, has been transferred to an Algapower lab in
Brazil. Shortly afterwards, his sister, still working for Intelligence,
arrives in Rio. Her new mission: to get in touch with her brother and
convince him to inform the authorities on the company and its mysterious
Mermaid Project. The stakes have changed for the Pennac siblings,
though: among the documents retrieved during the New York mission, their
names appear on a list of potential test subjects...