The Long War

The Long War by Terry Pratchett and Stephen Baxter follows the adventures and travails of heroes Joshua Valiente and Lobsang in an exciting continuation of the extraordinary science fiction journey begun in their New York Times bestseller The Long Earth.
 
A generation after the events of The Long Earth, humankind has spread across the new worlds opened up by “stepping.” A new “America”—Valhalla—is emerging more than a million steps from Datum—our Earth. Thanks to a bountiful environment, the Valhallan society mirrors the core values and behaviors of colonial America. And Valhalla is growing restless under the controlling long arm of the Datum government.
 
Soon Joshua, now a married man, is summoned by Lobsang to deal with a building crisis that threatens to plunge the Long Earth into a war unlike any humankind has waged before.

War has come to the Long Earth....

Humankind has spread across the new worlds opened up by stepping, which Joshua and Lobsang explored a mere decade ago. Now "civilization" flourishes, and fleets of airships link the multiple Earths through exploration, trade, and culture.

Humankind is shaping the Long Earth, but in turn the Long Earth is shaping humankind. A new America that has christened itself "Valhalla" has emerged more than a million steps from the original Datum Earth. And like the American revolutionaries of old, the Valhallans resent being controlled from afar by the Datum government.

In the intervening years, the song of the trolls—graceful, hive-mind humanoids—has suffused the Long Earth. But in the face of humankind's inexorable advance, they are beginning to fall silent . . . and gradually disappear.

Joshua, now married and a father, is summoned by Lobsang. It seems that he alone can confront the perfect storm of crises that threatens to plunge all of the Long Earth into war.

A war unlike any that has been waged before...

“As you’d expect from these authors, the writing is elegant and witty, peppered with sly pop-culture references. The worlds of the Long Earth are all richly rendered, and even the walk-on characters are deftly imagined…The Long Earth is a genuinely thoughtful and entertaining exploration of a profoundly changed universe-and the potential seems endless not just for the characters, but for Pratchett and Baxter as well.” - Tor.com

“The Long Earth is a brilliant Science Fiction collaboration with Stephen Baxter: a love letter to all Pratchett fans, readers, and lovers of wonder everywhere… This novel is a gift to be shared with anyone who loves to be amazed.” - Io9

“ The Long Earth is the solid start of a series with infinite potential.” - Shelf Awareness

“Stay tuned for the next episode of a very old-fashioned sf quest yarn (think Jules Verne and 2001) that, since Pratchett is involved, is crammed with scientifically informed amusement.” - Booklist

“In this thought-provoking collaboration, Pratchett (the Discworld series) and Baxter (Stone Spring) create an infinity of worlds to explore… fascinating premise.” - Publishers Weekly