Maya Delaney is a skin-walker - a supernatural who can Shift into the shape of a cougar. But just as she learns this extraordinary truth about herself, she also discovers that shifting comes with a terrible cost. With every transformation, a skin-walker loses touch with their human nature - and in time can lose their identity and their very sense of being human. Maya and her friends have been running from the people who experimented on them and created them as supernaturals. But now they realise they must confront their enemies if they are ever to have a future.