On January 15, 2004, the Bugaled Breizh suddenly sank off the coast of England, claiming the lives of the five French fishermen on board. That same day, NATO military exercises were taking place in the area. The disaster, as abrupt as it was unexplained, sends shockwaves through the victims’ families. Confronted with a legal process they struggle to understand and convinced that the true cause of the sinking is being concealed, Marie—the sister-in-law of one of the victims—emerges as their spokesperson. Determined to uncover the truth, she rallies the fishing community and embarks on a long and relentless fight for justice. Her partnership with the families’ lawyer draws her into the murky depths of the investigation, where the persistent shadow of a submarine looms over the case. As the search for answers intensifies, Marie’s life is changed forever.