The Long Earth Series by Terry Pratchett, Stephen Baxter

NORMALLY, WHEN THERE WAS NOTHING TO DO, HE LISTENED TO THE SILENCE.The Silence was very faint here. Almost drowned out by the sounds of the mundane world. Did people in this polished building understand how noisy it was? The roar of air conditioners and computer fans, the susurration of many voices heard but not decipherable.... This was the office of the transEarth Institute, an arm of the Black Corporation... moreNORMALLY, WHEN THERE WAS NOTHING TO DO, HE LISTENED TO THE SILENCE.The Silence was very faint here. Almost drowned out by the sounds of the mundane world. Did people in this polished building understand how noisy it was? The roar of air conditioners and computer fans, the susurration of many voices heard but not decipherable.... This was the office of the transEarth Institute, an arm of the Black Corporation. The faceless office, all plasterboard and chrome, was dominated by a huge logo, a chesspiece knight. This wasn't Joshua's world. None of it was his world. In fact, when you got right down to it, he didn't have a world; he had all of them.ALL OF THE LONG EARTH.The possibilites are endless. Just be careful what you wish for....)1916: The Western Front. Private Percy Blakeney wakes up. He is lying on fresh spring grass. He can hear birdsong, and the wind in the leaves. Where has the mud, blood and blasted landscape of no-man's-land gone? For that matter, where has Percy gone?2015: Madison, Wisconsin. Police officer Monica Jansson is exploring the burned-out home of a reclusive--some said mad, others allege dangerous--scientist who seems to have vanished. Sifting through the wreckage, Jansson finds a curious gadget: a box containing some rudimentary wiring, a three-way switch, and...a potato. It is the prototype of an invention that will change the way humankind views the world forever.The first novel in an exciting new collaboration between Discworld creator Terry Pratchett and the acclaimed SF writer Stephen Baxter, The Long Earth transports readers to the ends of the earth and far beyond. All it takes is a single step.... less

A generation after the events of The Long Earth, mankind has spread across the new worlds opened up by Stepping. Where Joshua and Lobsang once pioneered, now fleets of airships link the stepwise Americas with trade and culture. Mankind is shaping the Long Earth - but in turn the Long Earth is shaping mankind.. moreA generation after the events of The Long Earth, mankind has spread across the new worlds opened up by Stepping. Where Joshua and Lobsang once pioneered, now fleets of airships link the stepwise Americas with trade and culture. Mankind is shaping the Long Earth - but in turn the Long Earth is shaping mankind... A new 'America', called Valhalla, is emerging more than a million steps from Datum Earth, with core American values restated in the plentiful environment of the Long Earth - and Valhalla is growing restless under the control of the Datum government...Meanwhile the Long Earth is suffused by the song of the trolls, graceful hive-mind humanoids. But the trolls are beginning to react to humanity's thoughtless exploitation... Joshua, now a married man, is summoned by Lobsang to deal with a gathering multiple crisis that threatens to plunge the Long Earth into a war unlike any mankind has waged before. less

2040-2045: In the years after the cataclysmic Yellowstone eruption there is massive economic dislocation as populations flee Datum Earth to myriad Long Earth worlds. Sally, Joshua, and Lobsang are all involved in this perilous work when, out of the blue, Sally is contacted by her long-vanished father and inventor of the original Stepper device, Willis Linsay. He tells her he is planning a fantastic voyage across the Long Mars and wants her to accompany him... more2040-2045: In the years after the cataclysmic Yellowstone eruption there is massive economic dislocation as populations flee Datum Earth to myriad Long Earth worlds. Sally, Joshua, and Lobsang are all involved in this perilous work when, out of the blue, Sally is contacted by her long-vanished father and inventor of the original Stepper device, Willis Linsay. He tells her he is planning a fantastic voyage across the Long Mars and wants her to accompany him. But Sally soon learns that Willis has ulterior motives ... Meanwhile U. S. Navy Commander Maggie Kauffman has embarked on an incredible journey of her own, leading an expedition to the outer limits of the far Long Earth. For Joshua, the crisis he faces is much closer to home. He becomes embroiled in the plight of the Next: the super-bright post-humans who are beginning to emerge from their 'long childhood' in the community called Happy Landings, located deep in the Long Earth. Ignorance and fear are causing 'normal' human society to turn against the Next - and a dramatic showdown seems inevitable . . . less

It is the middle of the twenty-first century.After the cataclysmic upheavals of Step Day and the Yellowstone eruption, humanity is spreading farther into the Long Earth. Society, on a battered Datum Earth and beyond, continues to evolve.And new challenges emerge.Now an elderly and cantankerous AI, Lobsang is living with Agnes in an exotic, far-distant world. He's determined to lead a normal life in New Springfield—they even adopt a child. But there are rumors, strange sightings in the sky... moreIt is the middle of the twenty-first century.After the cataclysmic upheavals of Step Day and the Yellowstone eruption, humanity is spreading farther into the Long Earth. Society, on a battered Datum Earth and beyond, continues to evolve.And new challenges emerge.Now an elderly and cantankerous AI, Lobsang is living with Agnes in an exotic, far-distant world. He's determined to lead a normal life in New Springfield—they even adopt a child. But there are rumors, strange sightings in the sky. On this world, something isn't right. . . .Millions of steps away—learning about a hidden family history and the father he never knew—Joshua receives an urgent summons from New Springfield.Lobsang has come to understand that what has blighted his Earth is also a threat to all the worlds of the Long Earth. Countering this threat will require the combined efforts of humankind, machine, and the super-intelligent Next. And some must make the ultimate sacrifice. . . . less

2070-71. Nearly six decades after Step Day and in the Long Earth, the new Next post-human society continues to evolve. For Joshua Valienté, now in his late sixties, it is time to take one last solo journey into the High Meggers: an adventure that turns into a disaster. Alone and facing death, his only hope of salvation lies with a group of trolls. But as Joshua confronts his mortality, the Long Earth receives a signal from the stars... more2070-71. Nearly six decades after Step Day and in the Long Earth, the new Next post-human society continues to evolve. For Joshua Valienté, now in his late sixties, it is time to take one last solo journey into the High Meggers: an adventure that turns into a disaster. Alone and facing death, his only hope of salvation lies with a group of trolls. But as Joshua confronts his mortality, the Long Earth receives a signal from the stars. A signal that is picked up by radio astronomers but also in more abstract ways – by the trolls and by the Great Traversers. Its message is simple but ts implications are enormous:JOIN US.The super-smart Next realise that the Message contains instructions on how to develop an immense artificial intelligence but to build it they have to seek help from throughout the industrious worlds of mankind. Bit by bit, byte by byte, they assemble a computer the size of a continent – a device that will alter the Long Earth’s place within the cosmos and reveal the ultimate, life-affirming goal of those who sent the Message. Its impact will be felt by and resonate with all – mankind and other species, young and old, communities and individuals – who inhabit the Long Earths… less