Giants Books
The man on the moon was dead. They called him Charlie. He had big eyes, abundant body hair and fairly long nostrils. His skeletal body was found clad in a bright red spacesuit, hidden in a rocky grave. They didn't know who he was, how he got there, or what had killed him. All they knew was that his corpse was 50,000 years old and that meant that this man had somehow lived long before he ever could have existed!
Long before the world of the Ganymeans blew apart, millennia ago, the strange race of giants had vanished. All that remained of them was a wrecked ship, abandoned on a frozen moon of Jupiter. Now Earth's scientists were there, determined to ferret out the secret of the lost race. Then suddenly the Ganymeans returned, bringing with them answers that would alter all Mankind's knowledge of human origins . . .
Human society on Jevlen was falling apart -- and it looked as if JEVEX, the immense super-computer that managed all Jevlenese affairs, was at the heart of the matter. Except that the problems didn't stop when JEVEX was shut down. People were changing -- or being changed. It was almost as if the Jevlenese were being possessed... Meanwhile, in a very different universe, where magic worked and nothing physical was predictable, holy men caught glimpses of another place, a place where the shape of objects remained unchanged by motion, and cause led directly and logically to effect. And the best part was that when the heart was pure, the mind was focused, and circumstances were right, some lucky souls could actually make the transition to that other universe. If only they all could... From the Paperback edition.
When explorers on the Moon found a skeleton in a space suit of strange design, a baffling mystery began. The skeleton was undeniably human, but carbon dating showed it was older than the human race itself. The mystery deepened with the discovery of a wrecked ship on a moon of Jupiter, showing that another race had once inhabited the Solar System, originating on the now-shattered planet whose remains form the asteroid belt. Then a ship manned by the humanoid "giants" returned, bringing with it answers to the riddle of humanity's origins. But it brought great danger, as Earth found itself caught in a battle between a benevolent alien empire, and another offshoot of the human race who regarded the Earth as their property and were bent on taking it over. That was in the recent past, and the future now looked bright for Earth, as trade and knowledge flowed back and forth between Earth and Thuria, the world the Giants colonized when they left the Solar System aeons ago. Then Dr. Victor Hunt received a phone call-and the face in the phone's video screen was an older version of himself, calling from a parallel world. That was the first step in bridging the gap between the parallel universes of the "multiverse." Unfortunately, it also meant that the enemies who had been decisively defeated in one universe might still be alive and dangerous in another, and could arrive in force at any time. And the possibility soon became a frightening reality. . . .