Pip, a kelpie sent to our world as punishment, is forced into a human form. But she cannot even recall her crime—there are only fragments in her memory: a dead girl, a frozen lake, a heart taken. Welcomed by other fae, she discovers the fairy realm itself is disappearing. Their enigmatic leader believes Pip can save Otherworld—but she senses she cannot fully trust him. As she unravels the truth, she knows she can reclaim her true nature, but the human world may be the cost . . .