The Difference Engine


William Gibson - 1990
    Charles Babbage perfects his Analytical Engine and the computer age arrives a century ahead of its time. And three extraordinary characters race toward a rendezvous with history - and the future: Sybil Gerard - dishonored woman and daughter of a Luddite agitator; Edward "Leviathan" Mallory - explorer and paleontologist; Laurence Oliphant - diplomat and spy. Their adventure begins with the discovery of a box of punched Engine cards of unknown origin and purpose. Cards someone wants badly enough to kill for...Part detective story, part historical thriller, The Difference Engine is the first collaborative novel by two of the most brilliant and controversial science fiction authors of our time. Provocative, compelling, intensely imagined, it is a startling extension of Gibson's and Sterling's unique visions - in a new and totally unexpected direction!

Lest Darkness Fall


L. Sprague de Camp - 1941
    He knew where he was--Rome. He was there to study archaeology, and even though the lightning had left him dazed, he could see the familiar Roman buildings. But the buildings looked newer and the crowds in the street were wearing tunics, not suits! And a rich barnyard smell had replaced the gasoline-and-garlic aroma of modern Rome. So, when was he? And he was suddenly cold with fear of the answer...

The Mechanical


Ian Tregillis - 2015
    Armies of my kind have conquered the world - and made the Brasswork Throne the sole superpower.I am a faithful servant. I am the ultimate fighting machine. I am endowed with great strength and boundless stamina.But I am beholden to the wishes of my human masters.I am a slave. But I shall be free.

How Few Remain


Harry Turtledove - 1997
    It was an epoch of glory and success, of disaster and despair...1881: A generation after the South won the Civil War, America writhed once more in the bloody throes of battle. Furious over the annexation of key Mexican territory, the United States declared total war against the Confederate States of America once again. But this was a new kind of war, fought on a lawless frontier where the blue and gray battled not only each other but the Apache, the outlaw, the French, and the English. As Confederate General Stonewall Jackson again demonstrated his military expertise, the North struggled to find a leader who could prove his equal. In the Second War Between the States, the times, the stakes, and the battle lines had changed--and so would history...

The Years of Rice and Salt


Kim Stanley Robinson - 2002
    History teaches us that a third of Europe's population was destroyed. But what if? What if the plague killed 99 percent of the population instead? How would the world have changed? This is a look at the history that could have been: a history that stretches across centuries, a history that sees dynasties and nations rise and crumble, a history that spans horrible famine and magnificent innovation. These are the years of rice and salt.

Newton's Cannon


Greg Keyes - 1998
    . .1681: When Sir Isaac Newton turns his restless mind to the ancient art of alchemy, he unleashes Philosopher's Mercury, a primal source of matter and a key to manipulating the four elements of Earth, Air, Fire, and Water. Now, as France and England battle for its control, Louis XIV calls for a new weapon--a mysterious device known only as Newton's Cannon.Half a world away, a young apprentice named Benjamin Franklin stumbles across a dangerous secret. Pursued by a deadly enemy--half scientist, half sorcerer--Ben makes his fugitive way to England. Only Newton himself can help him now. But who will help Sir Isaac? For he was not the first to unleash the Philosopher's Mercury. Others were there before him. Creatures as scornful of science as they are of mankind. And burning to be rid of both . . .

Pavane


Keith Roberts - 1968
    That single tragedy set off a whole series of events, resulting in the Spanish Armada's defeat of England and subsequent demise of Protestantism. Now it's the 20th century, and the Church of Rome reigns supreme. People live a pastoral existence of guilds and farming, with technology held back to the level of the steam locomotive and primitive radio. Still, science cannot be held back forever...a revolution is building.

Terminal World


Alastair Reynolds - 2009
    Clinging to its skin are the zones, a series of semi-autonomous city-states, each of which enjoys a different—and rigidly enforced—level of technology. Horsetown is pre-industrial; in Neon Heights they have television and electric trains . . .Following an infiltration mission that went tragically wrong, Quillon has been living incognito, working as a pathologist in the district morgue. But when a near-dead angel drops onto his dissecting table, Quillon's world is wrenched apart one more time, for the angel is a winged posthuman from Spearpoint's Celestial Levels—and with the dying body comes bad news.If Quillon is to save his life, he must leave his home and journey into the cold and hostile lands beyond Spearpoint's base, starting an exile that will take him further than he could ever imagine. But there is far more at stake than just Quillon's own survival, for the limiting technologies of the zones are determined not by governments or police, but by the very nature of reality—and reality itself is showing worrying signs of instability . . .Terminal World is a snarling, drooling, crazy-eyed mongrel of a book: equal parts steampunk, western, planetary romance, and far-future SF.

The Iron Dream


Norman Spinrad - 1972
    (Jun 1986, Norman Spinrad, Bantam Spectra, 0-553-25289-5, $3.95, 256pp, pb) Cover: Catherine Huerta

Time's Eye


Arthur C. Clarke - 2003
    Suddenly the planet and every living thing on it no longer exist in a single timeline. Instead, the world becomes a patchwork of eras, from prehistory to 2037, each with its own indigenous inhabitants.Scattered across the planet are floating silver orbs impervious to all weapons and impossible to communicate with. Are these technologically advanced devices responsible for creating and sustaining the rifts in time? Are they cameras through which inscrutable alien eyes are watching? Or are they something stranger and more terrifying still?The answer may lie in the ancient city of Babylon, where two groups of refugees from 2037: three cosmonauts returning to Earth from the International Space Station, and three United Nations peacekeepers on a mission in Afghanistan have detected radio signals: the only such signals on the planet, apart from their own. The peacekeepers find allies in nineteenth-century British troops and in the armies of Alexander the Great. The astronauts, crash-landed in the steppes of Asia, join forces with the Mongol horde led by Genghis Khan. The two sides set out for Babylon, each determined to win the race for knowledge . . . and the power that lies within.Yet the real power is beyond human control, perhaps even human understanding. As two great armies face off before the gates of Babylon, it watches, waiting. . . .

The Half-Made World


Felix Gilman - 2010
    What exists has been carved out amidst a war between two rival factions: the Line, paving the world with industry and claiming its residents as slaves; and the Gun, a cult of terror and violence that cripples the population with fear. The only hope at stopping them has seemingly disappeared--the Red Republic that once battled the Gun and the Line, and almost won. Now they're just a myth, a bedtime story parents tell their children, of hope. To the west lies a vast, uncharted world, inhabited only by the legends of the immortal and powerful Hill People, who live at one with the earth and its elements. Liv Alverhyusen, a doctor of the new science of psychology, travels to the edge of the made world to a spiritually protected mental institution in order to study the minds of those broken by the Gun and the Line. In its rooms lies an old general of the Red Republic, a man whose shattered mind just may hold the secret to stopping the Gun and the Line. And either side will do anything to understand how.

All My Sins Remembered


Joe Haldeman - 1977
    The only problem is that the Confederacion needs him as one of its twelve Prime Operators for its secret service, the TBII. The TBII wants him as a spy, thief & assassin. It's not, of course, a problem for the Confederacion, which simply uses immersion therapy & hypnotic personality overlay for Otto's training, then sends him out in deep cover, encased in plastiflesh, on a variety of dangerous missions on a number of bizarre worlds. But for him, it's a different matter: what he has to witness & what he's forced to do take a terrible toll. Always he returns to his original self--his conscience stabbed by the memory of all those he'd killed in the service of interstellar harmony.

Pastwatch: The Redemption of Christopher Columbus


Orson Scott Card - 1996
    In one of the most powerful and thought-provoking novels of his remarkable career, Orson Scott Card's Pastwatch interweaves a compelling portrait of Christopher Columbus with the story of a future scientist who believes she can alter human history from a tragedy of bloodshed and brutality to a world filled with hope and healing.

The Zero Stone


Andre Norton - 1968
    Murdoc Jern, gem trader, finds that possession of the stone has led him to the center of a web of intrigue and murder.With his companion Eet, an inscrutable feline mutant with phenomenal ESP powers, he is hunted through space, coming finally to a long forgotten planet inhabited by apelike "sniffers." There, facing the predatory sniffers, the antagonistic Patrol and the laser-guns of the Thieves' Guild, Murdoc must seek the source of the Zero Stone and bargain for his right to pursue his destiny as a free man.

The Separation


Christopher Priest - 2002
    The Separation suggests an alternate history lying along a road not taken in World War II. But there are complications. In 1999, history author Stuart Gratton is intrigued by a minor mystery of the European war which ended on 10 May 1941. The British-German armistice signed that month has had far-reaching consequences, including a resettlement of European Jews in Madagascar. In 1936, the identical twin brothers Joe and Jack Sawyer win a rowing medal for Britain in the Berlin Olympics: it's presented to them by Rudolf Hess. The brothers are separated not only by a twin's fierce need "to be treated as a separate human being", but by sexual rivalry and even ideology. When war breaks out Jack becomes a gung-ho bomber pilot, Joe a conscientious objector. Still they're inescapably linked, and sometimes confused. Both suffer injuries and hauntingly similar ambulance journeys. Churchill writes a puzzled memo (later unearthed by Gratton) about the anomaly of a registered-pacifist Red Cross worker flying planes for Bomber Command. Hess has significant, eventually incompatible meetings with both men. Contradictions are everywhere. As in his magical 1995 novel The Prestige Priest is fruitfully fascinated by the legerdemain of twins, doubles, impostors, symmetrical roles. Churchill's double briefly appears. So does the famous conspiracy theory that the Hess who flew to Britain with his quixotic peace deal wasn't the real Hess ring true? Clearly The Separation was impressively, extensively researched. Its evocations of bombing raids--from either side of the bomb sites--are memorable. The unfolding story strands become increasingly disorienting and hallucinatory; the easy escape route of dismissing one strand as delusion is itself subtly undermined. The Separation is filled with a sense of the precariousness of history; of small events and choices with extraordinary consequences. --David Langford