Harland, Richard

Sixteen-year-old Col Porpentine is being groomed as the next Commander of Worldshaker, a juggernaut where elite families live on the upper decks while the Filthies toil below, but when he meets Riff, a Filthy girl on the run, he discovers how ignorant he is of his home and its residents.

After the Filthies seize control of the massive juggernaut Worldshaker, now called Liberator, members of the former elite, Swanks, remain to teach them, but class differences continue to cause strife and even Col and Riff may be unable to bring unity.

Sixteen-year-old Col Porpentine is being groomed as the next Commander of Worldshaker, a juggernaut where elite families live on the upper decks while the Filthies toil below, but when he meets Riff, a Filthy girl on the run, he discovers how ignorant he is of his home and its residents.