Cat Connolly is a Thyla now. She's not sure where her life is heading, but she knows she doesn't want to go back to the human world. But all is not well among the shapeshifters. The treaty between the Thylas and the Sarcos is causing tension and the malevolent Diemens are still on the hunt. Then into Cat's life wanders someone who should be an enemy but acts like a friend - and everything changes again. She discovers more about shapeshifters and Diemens, about Tessa, and about her own heart. Vulpi continues the story of Tasmania begun in Thyla. It is the story of how the shapeshifters were created, and a clue to what they might become. It is the story of what happened to Cat, and about the decisions we all must make as we learn how to be.