Both Nimh and her enemy, Inshara, have been sent to the cloudlands. Above, 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 impostor wields her name with deadly purpose. Below, North looks to the sky, desperate to join the ones he loves and return to his world. But with only a traitor willing to help him, and others clamouring for him to take Nimh's place, the journey seems more impossible than ever. Enemies lurk in each world, and tragedy looms as the cloudland engines falter and mist rains terror on the surface. In their desperation to reunite and save their people, Nimh and North face one ultimate question: Can they defy their love and their destiny to save their homes? Or will the spark between them ignite their worlds and consume them altogether?