Who killed the leader of the gang? On the sailboat caught in the storm, each suspects the other...

Four teens, close friends from a small Breton village. The sea is their playground. Their leader is the charismatic Clarence, whose motto is "Be different, be better than the rest." One day, he introduces his stepbrother Victor to the gang. But Victor opens their eyes to the toxicity of Clarence's tyranny. When they all decide to sail to Ireland, tension and resentment mount in the ship's cramped quarters. Then Clarence dies. To make matters worse, a storm is headed straight for them. How to stay friends and not be charged with murder when they're doing their hardest just to survive?