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On Rollrock Island, the fishermen find their brides from the sea through the usurial offices of the witch Miskaella. They're selkies; seal women who shed their skins to become human. Their husbands are obsessed by them and the men without a selkie will risk anything to become part of the enchantment, even their human wives and children and half their lifetime earnings. Soon there are no human women left on Rollrock - the adults to the mainland and the female selkie babies to the ocean. There are just dads and mams and little boys.