Abigail is shocked by Prigent's death, swept away by the explosion of one of the bombs dating from the First World War lining the seabed. And Sylvia, his sister-in-law, an environmental activist he had tailed, is in a coma. Defying the ban on going out to sea, the scientist returned to the water to understand and record the seismic activity present in the fault off the coast of Fécamp.
