When a long-lost army suddenly appears from beneath the clouds, one impulsive decision made by Diandra "Dee" Diesel will change her destiny forever. With only her broken-down robot and a mysterious flying engine to help her, Dee is sent on a sky bound journey that will take her from the darkest wastelands below the clouds to the brightest capital of her world. Her greatest challenge will be to look beyond her family legacy and create a destiny of her own choosing.