sentences:  Is travels with the other children, who believe they are being taken to a better life, but armed with her suspicions and a quick wit, Is makes a successful bid for freedom.Whilst the other children are enslaved and taken to the coal-mines, Is remains at liberty in the overground town of Blastburn.She meets with local relatives, including her uncle Roy, who is the dictator of the new country, and also other residents of the derelict town, including Doctor Lemman, whose apprentice she becomes to excuse her presence in Blastburn (children in that area are all sent to the coal-face).