Submerged: a Something in the Water story - Paperback

Cas came home to settle his estranged father's affairs when he cuts a seal from fishing line. Then, a mysterious woman named Yara follows him home and offers him her servitude in exchange for saving his life. She's a Selkie, a seal who sheds her skin to be a woman. If a human takes her skin, she loses her ability to transform. But Cas returns it to her and offers to let her stay with him and his beloved grandmother as roommates. She's discovering what it is to be human, he's second-guessing everything he thought he knew.