Antoine is 40, with two children and a divorce about to happen. So he examines his existential anguish, realizing that the death of his mother, who was found drowned near the island of Noirmoutier, is the source of his doubts. Together with his sister Agathe, he goes back to the place they grew up in search of the truth behind their family’s troubled past – a truth that is not only hard but also dangerous…

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