What would have happened if the apple hadn't fallen on Newton's head is about to happen to Yngmor.

Temple Fledgling Terek is the one man who conceives a way to stop the barbarian hordes that threaten to destroy his civilization. He is the one man who recognizes that his planet is not the center of the universe. He is Yngmor's "Newton," and for his theories he is branded a heretic, his ideas mocked, and his life placed in deadly jeopardy.

But Terek saw another strange thing as well: the creatures from the skies. Creatures named Chet and Tina Barlin, two humans on a field-work study for their own planet...at just the wrong time for Yngmor. To Terek they are godlike beings, capable of powerful magic: but the quasimaterials with which they hope to help against the invaders seem to invalidate Terek's revolutionary ideas. Chet and Tina may help too much a culture that is almost ready to help itself.

Genre: Science Fiction