The Doctor takes his new companion, Grant, back home to Agora -- only to find a world in the thrall of some of his oldest and deadliest foes.

The Cybermen have taken control and set up a breeding colony to propagate their own race. While the Doctor languishes in a cell at the mercy of the sadistic Overseers, Grant joins up with a group of rebels and works on a desperate rescue bid.

With time running out, the rebels move into action. But will their solution prove more deadly than the problem itself?
(from the publisher)