Evelyn Carool leaves the country town where she grew up and goes to Sydney to work for Blue, an author of children's books. Blue inhabits a mysterious stone cathedral, Blackrock, which rises up out of Sydney Harbour. Acting as Evelyn's mentor, Blue leads Evelyn on a journey of self-discovery that is at once magical, sensuous and frightening. Must she completely surrender her own sense of reality to access this infinitely more seductive world? And what price is she prepared to pay to learn the truth that lies hidden within the walls of Blackrock?