The Silent Invaders

Description for THE SILENT INVADERS by Robert Silverberg:

A GRIPPING TALE OF ALIEN CONQUEST AND HUMAN COURAGE.

When Major Abner Harris came to Earth from the depths of space, few guessed it marked the beachhead for an alien invasion. For Harris was not a human at all, but a member of the Darruui, a ruthless race of extraterrestrial invaders sent to wage a shadow war to wrest Earth from the grip of their age-old alien enemies, the Medlins.

Trapped in a human body, the being called Harris began to feel a human's feelings, hopes, longings. From a Medlin commander disguised as a beautiful Earth woman Harris learned the truth about his own way of life, and a remarkable secret that would alter the destiny of the heavens.