In Sea-Salt Tears (October Daye, #05.1)

It was 1972, and a teenage girl named Elizabeth Ryan thought that her world was coming to an end. Elizabeth was the daughter of two Selkies, you see, and she had just been passed up for a skin. But then a mysterious cousin who calls herself Annie appears, and Elizabeth finds other things to think about...
It can be easy to forget that worlds don't wait for heroes before they begin. It can be easy to forget that things happened before the lights came up and the story started. This is one of those things that happened: this is one of those tales that slipped through the cracks. It is the story of a girl named Elizabeth, and a girl named Annie, and what they were to one another, in the sight and sounding of the sea.
Maybe it isn't fair. But fairy tales never really are.