Carla and Tully are on a journey, down wormholes, through portals opened by Travellers, into the forests of a parallel world, along the star paths of dreams, and finally, following the root path of the Tree of Life to Paradisio, the hub of all creation, where they believe they will find their true home. But Carla fears that their travels have changed them so utterly that the high-school romantics they once were have been lost on the way. To find themselves, they must accept who and what they are—the only ones who have any chance of stopping the corruption that is destroying Paradisio.