"I was born in the sea.

On the night Mum gave birth, the waves rolled towards the beach like giants, and my mother cried like the gulls. She cried out for the sea, long enough for my father to give in and carry her labouring body outside. There, she lay in a white gown on her back in the mud, her legs open in the surf. The waves carried me forth. Before even my father could grab hold of me, I had made my first acquaintance with the salty waters."

Nimue knows her mother only from stories. After an all-consuming storm, she decides to search for her with her younger brother Arthur. During their journey, they discover that their family history has led to a battle against a disease that seems to be wiping out all of humanity. Will they find their mother? Can they stand up to their ruthless uncle? And what role do Arthur and Nimue themselves have to play, given their lineage?