On remote Rollrock Island, the sea-witch Misskaella discovers she can draw a girl from the heart of a seal. So, for a price, any man might buy himself a bride; an irresistibly enchanting sea-wife. But what cost will be borne by the people of Rollrock - the men, the women, the children - once Misskaella sets her heart on doing such a thing?Margo Lanagan weaves an extraordinary tale of desire and revenge, of loyalty, heartache and human weakness, and of the unforeseen consequences of all-consuming love.