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Abigail, an oceanologist, was sent by IFREMER on a mission to Fécamp, which she had left a few years earlier following a personal tragedy. She must investigate the inexplicable sinking of the Rose Davies, one of her father's trawlers with 14 sailors on board. While she is conducting her search for the wreck with the gendarme Prigent, mysterious phenomena occur at sea.

Navigation is prohibited after a container ship deviates from its course by hitting an unknown obstacle. Abigail, who alerted authorities to the risks of shipping, faces anger from the fishing community, including her father, Henri, and Julien, her husband and father of the child they lost. Jimmy, Abigail's son-in-law, witnesses a strange phenomenon of luminescence on the sea.

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.

Soldiers, led by Commander Calderi, have taken over the port of Fécamp. With the help of Jimmy and his sidekicks, Axelle, Youssef and André, Abigail tries to identify the source of electromagnetic disturbances in the sea, and the strange luminescence observed by Jimmy.

Soldiers, led by Commander Calderi, have taken over the port of Fécamp. With the help of Jimmy and his sidekicks, Axelle, Youssef and André, Abigail tries to identify the source of electromagnetic disturbances in the sea, and the strange luminescence observed by Jimmy.

Soldiers, led by Commander Calderi, have taken over the port of Fécamp. With the help of Jimmy and his sidekicks, Axelle, Youssef and André, Abigail tries to identify the source of electromagnetic disturbances in the sea, and the strange luminescence observed by Jimmy.