If it is possible to conquer space, then perhaps it is also possible to conquer time. At least that was the theory American scientists were exploring in an effort to explain the new sources of knowledge the Russians possessed. Perhaps Russian scientists had discovered how to transport themselves back in time in order to learn long-forgotten secrets of the past.

An orphan, Blake Walker has never really known who he was, and his strange flashes of intuition have always set him apart from those who raised him and everyone else he has known. Acting on one of those flashes, he prevented a murder. But neither the assailant nor his intended victim were from the world Walker had always known - he had stumbled onto the greatest secret of the ages. Our Earth is only one of an infinite number of Earths, each with a slightly different history from the others, each separated from the others in a crosstime dimension.

"The Defiant Agents" tells of an encounter between Western heroes, and the Russian Communists, and a mysterious alien race that has used time travel to alter Earth. The alien library discovered in the previous novel ("Galactic Derelict", published in 1959) proved to have locations of many unknown worlds. Finding the secure location of planet Topaz compromised, Apache operatives, including Travis Fox, are sent on an emergency trip by Earth with a mind-altering machine, Redax, that crash lands.

"Voodoo Planet" is a 1959 sci-fi novella by Andre Norton. Dane, Captain Jellico and the medic Tau are left stranded on the planet Khatka, settled a long time ago by Africans, after the Second Atomic War. The heroic trio experiences fights with dangerous life forms and also take on an evil witch doctor who is plotting to overtake the government... This is the third part of the "Dane Thorson/Solar Queen" series.

Was Andas an android - or the rightful emperor, held prisoner on a distant planet while an android impersonated him on the empire's throne world? Was Tallhassee Mitford a modern archaeologist suffering from strange delusions, or has an ancient Egyptian ankh somehow hurled her personality far back in the mists of time to a Nubian kingdom where she is now a warrior princess named Ashake, caught up in a struggle between the gods of Egypt? Two very different heroes in the grip of forces beyond control, beyond comprehension, both destined to be the only hope of doomed civilizations.

Centuries after the civilized world destroyed itself in a dimly-remembered final war, a few rebels courageously searched through the shattered cities-trying to regain old knowledge.

It was the time of the Moon of the Three Rings when the Free Trader ship Lydis landed on the planet Yiktor and junior crew member Krip Vorlund visited a beast show. He was strangely attracted to the owner of the show animals, a delicate and mysterious woman named Maelen. Soon Krip was caught in a vicious struggle by powerful opponents over the fate of Yiktor - and he learned the nature of Maelen's sorcery when he found his mind trapped in the body of a wolf-like creature.

Set on a planet in a parallel universe where magic is a reality, these high fantasy novels from the Witch World series transport you to the western continent of High Hallack, illustrating why prolific author Andre Norton was named a Grand Master by the Science Fiction and Fantasy Writers of America.

In this story, an alien race known as the "Throgs" attacks a Terran survey camp without warning. "Eye-searing lances of energy lashed back and forth across the base with methodical accuracy, and a single cowering witness, flattened on a ledge in the heights above, knew that when the last of those yellow-red bolts fell, nothing human would be left alive down there."

The Stars Are Ours: Dard Nordis is a hunted man. His brother was murdered for covert activities as a scientist in a world in which scientists and engineers are blamed for the global war that smashed civilization. Star Born: Centuries after the desperate flight from Earth, Pax has been overthrown and humanity again reaches for the stars. Rof Kurbi's spaceship reaches the planet Astra, but he and the crew do not know that the planet already has a colony established centuries ago.

The birth of a hero is never easy. Clumsy as an elephant in high heels, he is nothing like his legendary scout father. But inside that bull-moose-of-a-body lies the heart of a hero whose moment has arrived! Next, a boy survives alien invasion - but must learn to think and act like his reptilian enemy to exact retribution for slaughter. These and two other tales of coming-of-age-through-peril from the writer who invented the genre, Andre Norton.

Impoverished and without hope, Naill Renfro sells himself into indentured servitude and is transported across the galaxy to the far-off jungle world of Janus. Naill hopes to work off his debt and begin his life again. But the harsh masters of Janus are destroying the priceless treasures of the planet's ancient culture - and when Naill, entranced by the beauty of an alien artifact, is caught trying to hide it, he is exiled and left to die in the jungle. But Naill inexplicably begins to remember another life, in another time - a time when he was not human, but something else

Murdoc Jern's father, an interstellar gem trader, was murdered by outlaw competitors and left behind an odd ring, large enough to fit over the finger of a space suit. With his companion Eet, a strange feline mutant with phenomenal mental powers, he soon discovered that the stone in the ring was actually a Zero Stone - an alien device left behind by an ancient vanished race - and it was the key to powers beyond human imagination. Murdoc and Eet had to solve the secret of the Zero Stone, and very quickly, because very greedy and dangerous people wanted that ring.

Only as interstellar mercenaries can humans go to the stars; the aliens who already dominate the galaxy allow no other recourse. But when Swordsman Third Class Kana Karr and his comrades-in-arms are betrayed and abandoned on a hostile world by their alien masters, the warriors from Earth begin a desperate but glorious march across a planet whose every sword is against them. Their actions may doom humanity's future...or lead the way to an empire of their own!

The planet Korwar was a glittering jewel of a world, inhabited by the galaxy's wealthiest, visited by the upper classes of other worlds in search of diversion. The jewel had a flaw: the Dipple, its name coming from a contraction of "displaced person", where the misfits, the hopeless, the penniless eke out a wretched existence on the dole. Two young men hoped to escape from the Dipple.

If it is possible to conquer space, then perhaps it is also possible to conquer time. At least that was the theory American scientists were exploring in an effort to explain the new sources of knowledge the Russians possessed. Perhaps Russian scientists had discovered how to transport themselves back in time in order to learn long-forgotten secrets of the past.

The Western Conference discovers the Reds have stolen their alien-source data on a colonizable planet...and so must rush their plans for an expedition. When their spaceship crashes on Topaz, Travis Fox and his party of modern Apache Indians, reverted to their tribal ancestral memories, find they have already been beaten there. And they must deal with more than Reds - for the Reds have brought along reverted members of Ghenghis Khan's Mongol Horde!

Impoverished and without hope, Naill Renfro sells himself into indentured servitude and is transported across the galaxy to the far-off jungle world of Janus. Naill hopes to work off his debt and begin his life again. But the harsh masters of Janus are destroying the priceless treasures of the planet's ancient culture - and when Naill, entranced by the beauty of an alien artifact, is caught trying to hide it, he is exiled and left to die in the jungle. But Naill inexplicably begins to remember another life, in another time - a time when he was not human, but something else

Only as interstellar mercenaries can humans go to the stars; the aliens who already dominate the galaxy allow no other recourse. But when Swordsman Third Class Kana Karr and his comrades-in-arms are betrayed and abandoned on a hostile world by their alien masters, the warriors from Earth begin a desperate but glorious march across a planet whose every sword is against them. Their actions may doom humanity's future...or lead the way to an empire of their own!

Left homeless by the war that reduced Terra to a radioactive cinder, Hosteen Storm - Navaho commando and master of beasts - is drawn to the planet Arzor, to kill a man he has never met. On that dangerous frontier world, aliens and human colonists share the land in an uneasy truce. But something is upsetting the balance, and Storm is caught in the middle. He had thought the war was over - but was it?