Beyond the end of the world

"Above, in the cloudlands, Nimh has no memory of her past, only an aching, undying certainty that she has left something--someone--behind. But while she struggles to recall her identity, an imposter wields her name with deadly purpose. Below, on the surface, North looks to the sky, desperate to join the person he loves and return to his world. But with only a traitor willing to help him, and others clamoring for him to take Nimh's place, his home...