cover - A space-craft crashes and explodes in a ball of yellow.

Earth has been taken over by a strange alien force - creatures whose instinct for survival overrides any human resistance.

 Then a vital weapon - with the power of electronically warping the mind - falls into the hands of a terrorist group still strong enough to oppose the aliens. A weapon so powerful that it cannot be controlled.

The control of Earth is in the balance - and the balance is a terrifyingly precarious one.

Philip K Dick