Snell, experienced deep space explorer of unknown worlds, had a special mission: to find another explorer, was lost at the far side of the galaxy. He found him, rescued him, but was trapped. The planet was ordinary enough: he could breathe the air; the gravity was not a problem; he was more evolved that the primitive inhabitants. He had found Trynellian, had saved him, but now had to deal with enemies he had made.His ship was gone, virtually destroyed after being pulled from orbit mysteriously.The Dark Ship was still there...somewhere.Escape from the planet was not a possibility, so he would have to fight to survive...Gildas, a young priest, wanted nothing more than to return to his studies in Paris, unfortunately he had met Sarah. But not before the strange man who had fallen from the sky had done something strange to his mind.And then worse than that--his memory had been destroyed and he was back at his uncle's house where he had spent his childhood before going to Paris to study. And he knew that both memories could not be true.What about Sarah? Would he ever see her again? Did she really exist?None of this mattered, of course, because the giant armored caterpillar-like alien monsters and their meteor sized Dark Ship had returned to Earth to seek revenge and destroy the planet. And the aliens that could walk through time that wanted to recruit Snell.The enemies could not be stopped. Or could they? Did they have an Achilles heel?