In their tiny, sea-beaten cottage on the north coast of Scotland, Liska and Ruth await the birth of their first child.

Each passes the time by telling the baby stories, trying to pass on the lessons they've learned: tales of circuses and stargazing, selkie fishermen and domestic werewolves, child-eating witches and broken-toothed dragons.

But they must keep their storytelling a secret from one another, as they've agreed to only ever tell the plain truth. So to cloak their tales, Ruth tells her stories when Liska is at work, to a background of shrieking seabirds; Liska tells hers when Ruth is asleep, with the lighthouse sweeping its steady beam through the window.