Neva Patterson

Fifty spaceships, each three miles across, hover ominously above Earth's major cities. The Visitors that emerge are humanlike in appearance and extend the hand of friendship. Our planet's resources are just what these aliens need to survive. And for its future survival, unsuspecting humankind will need... a miracle!

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Roy Tucker, a Vietnam war veteran with excellent shooting skills, is serving a long prison sentence when a mysterious visitor promises him that he will be released if he agrees to carry out a dangerous assignment.

V

The Domino Principle