The Coming of the Whirlpool (Ship Kings #1)

Young Dow Amber is no sailor. But driven by a strange sea-longing he ventures down to the great grim bay known as the Claw. He hopes to learn there of seafaring, but he finds only a fearful people who scarcely dare sail at all, for they have been cursed by a monstrous whirlpool that haunts the bay, stealing away their sons.