Everything has turned upside-down for Penelope Wilder, a half-cat, half-girl. Her whole entire village in Animalia, the land of the half-animals has been destroyed by the eruption of Mount Anaconda. Now, her family decides to move to the continent of the humans, Humania, and start a new life there. Penelope must face the hardships of trying to fit in and finding the place she belongs in.