The story of two very different women, one mortal, one mermaid, and the clash between worlds best kept apart...It is a cold day at the end of the world when a young woman, a princess in hiding, looks out across a Northern sea and sees something she could not have seen. It looks...it can't be. It looks like a mermaid's tail. And, as she looks more closely, she sees that the mermaid is dragging a drowning sailor in her arms. Because, only hours before, another princess, the daughter of the Sea Queen, famous for her unwise love of humans, has decided to risk everything and take a look at the world above the sea: the world of mortals. And there she finds a storm, a shipwreck, a sailor, and sets in train events which will change both women's worlds for ever.