|Paperback Library Edition. First printing, July 1966.|
Cover by Ed Valigursky (thanks, Mark).
"Earth was programmed for destruction in the mad war of the computer worlds - unless the Solarians could stop the machines!
Three hundred years ago the solarians retreated to the safety of their Fortress as Earth became embroiled in the first of the computer wars with the dread Duglaari Empire.
The solarians' final word to all humanity was a promise to reappear one day and bring it to victory. Suddenly, with Earth on the verge of becoming a helpless victim of the merciless Duglaars, the Solarians made contact with fleet commander Jay Palmer. It was an offer of aid.
But the Solarians' plan was so cunning, so fraught with danger, that Jay faced the greatest decision of his life - and that of Earth's:
Accept their ingenious strategy as a stroke of genius or reject it as a trick designed to destroy human life forever."