In the mind of Ayako, an old woman in exile on a mountain in medieval Japan, nothing is certain, and nothing holds a familiar shape for long. This is a map of a psyche exalted and destroyed by solitude, and on its contorted surface Shinto philosophy, Greek mathematics, Hawaiian goddesses, Egyptian legend, quantum physics, and Babylonian myth meet and merge... In Catherynne M. Valente's second novel since the critically acclaimed The Labyrinth, language and myth construct a strange new geography of the self. This is The Book of Dreams: open it and walk the shadowy paths of this extraordinary landscape.