After the death of a second patient infected by the unknown pathogen, Maral was able to establish that the contamination had taken place in the North Sea. The bacterium is thought to be very old and to have originated in the melting permafrost of Greenland. Thomas Nguyen, the Minister of Health, decides to ban access to all beaches. For her part, Julia tries to dissuade their son from enlisting in the European Union army and having a chip implanted in his brain.