This is the final book in the ColSec triology, a middle-school level sci-fi series. The first two books are Exiles of ColSec and The Caves of Klydor. In the future, Earth is controlled by a repressive government that sends criminals and dissidents into exile on other planets. These exiles are assigned to different planets to form colonies by ColSec (short for Colonization Section). The government then reaps the benefits of whatever resources the colonists find or produce. However, the colonists have been plotting to take their destinies into their own hands.
Cord MaKiy and his friends hijack a ColSec ship and return to Earth to gather allies for the rebellion against Earth's government, called The Organization. They turn to the societies that they came from, little groups of outcasts on the fringes of Earth's society. Cord's people, the Highlanders who live in the wild areas of Scotland without modern technology, welcome them, and many of the young people are interested in joining the colonies, seeing other worlds, and living in freedom. Similarly, the rebels find more friends among the Vampires, the youth gang that lives in the Bunkers (what's left of the old subway system under London). However, the Streeters (a youth gang in the Chicago area) are a different story. Although many of them want to escape their little hideouts in the urban jungle called Limbo, their leader, Tuller, is unwilling to give up his relatively comfortable position of power. When he betrays the rebels to the government, the others have to decide where they stand and if they're willing to take the risks necessary to gain their freedom.
This is a fun series, and readers will cheer on Cord and his friends as they struggle to gain independence for themselves and others considered rejects by society.