One of the best brain doctors of his time, Nathi lost his own brain five centuries ago when he became a posthuman. He is called upon to save a comatose girl. The damage is extensive, so he decides to map his own mind into her brain in order to replace the damaged part. But something unexpected waits for him within the Girl's brain. She is a carrier of a Wish Fairy, an enigmatic sentient cyber being whose only purpose is to kill the Wish, a virus used by the ruling cyber Wizard Orders to enslave all posthuman minds, including Nathi's. Liberated, Nathi forms a symbiotic union--"the Dancer"--with the Girl, discovers the true cause of her brain injury, and finds a way to break out of the Castle, their high-tech prison, and into the Martian polar night. But once outside, the real chase begins. They must resist the cyber wizards trying to remotely regain control of their minds, while also sending a force in pursuit. It is a battle that must be fought both in the physical world and that of the mind.
