On the Tahitian peninsula, Paulot faces a day of endless mourning at home: his 16-year-old stepson Moana has drowned. Overwhelmed by grief, but a stranger to rituals that escape him, the adopted islander can find neither words nor a place in a blended family that he loves deeply but doesn't always understand. Like a man free diving, he plunges deep into his memories, facing demons before resurfacing, purified by a painful ordeal.