K-07M0 has never had a name. As a fox-bat, she has lived her entire life silently hiding from the other hybrids and the scientists who created her…until the day a new animal gives her the name Kozmo and they help each other escape the underground lab.

In the outside world Kozmo meets a pack of hybrids just like her, led by a feisty eagle-dog named Castor. But Castor and his pack are being viciously pursued, and Kozmo is forced to do something she's never done before: trust others to survive. Kozmo will discover that Castor and his friends have unexpected human allies but can they uncover the truth about why the Unnaturals were created together?