Sisters of Icarus. Icarus Child, #1

Once there was an island, and on that island there lived a boy, but before that boy there was another child. And before that child there were three sisters. Those sisters had a brother. His name was Icarus. Britain 163 BCOn a small island just off the south coast, three sisters are determined to survive against nature's unmerciful odds, but their brother is mad, everyone thinks they are strange and old voices cry on the wind.
Battling against love, grief, selkies and ghosts, middle sister Raccanta will face many tests of her strength if she intends to keep her sisters safe - and her promises intact. For on the mainland there lives a man who walks the woods and shows Raccanta a world that could tempt her far away. Except the island keeps what it takes and it has no intentions of letting any of its sisters go.