Just after the wave.
(Book)

Original title: Juste après la vague, copyright Éditions Denoël, 2018.

"When a volcano collapses in the ocean and generates a tidal wave of biblical proportions, the world disappears around Louie, his parents and his eight siblings. Their house, perched on a summit, stands firm. As far as the eye can see there is only choppy grey water. For six days the family waits for relief, as food becomes scarce. Then the water starts to rise again, and the parents realize they must make for the highlands. There isn't room, however, for everyone on the boat and they will have to choose between their children."--Publisher description.