The third novel in legendary author and Discworld creator Terry Pratchett and award-winning science fiction writer Stephen Baxter's “Long Earth” series, which Io9 calls “a brilliant science fiction collaboration.”

2040. The Long Earth is in chaos. . . .

The cataclysmic Yellowstone eruption is shutting down civilization. Whole populations flee to the relative safety of myriad stepwise Earths. Sally Linsay, Joshua Valiente, and Lobsang have all been involved in the perilous post-eruption clean-up.

But Joshua faces a crisis close to home. From a long childhood hidden deep in the Long Earth, a new breed of young, super-bright post-humans is emerging—but "normal" human society is turning against them, driven by ignorance and fear. For Joshua, caught up in the conflict, a dramatic showdown seems inevitable.

Meanwhile, U.S. Navy Commander Maggie Kauffman embarks on an incredible journey, leading an expedition to the unexplored limits of the far Long Earth.

And Sally is contacted by her long-vanished father, Willis Linsay, inventor of the original Stepper device. Ever the maverick, he is planning a fantastic voyage of his own—across the Long Mars. But what is his true motivation?

For Joshua, for humankind, for the Long Earth itself—everything is different now. Joshua 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 have caused “normal” human society to turn against the Next. A dramatic showdown seems inevitable. . . .

The complete list of books in the Long Earth series include:

The Long Earth
The Long War
The Long Mars
The Long Utopia
The Long Cosmos
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Winner of 7 awards including the Prism Award for Time Travel

London, September 1888
For veteran Time Rover Jacynda Lassiter, her current job assignment is no big deal: Find an overdue "time tourist" and return him to 2057, before he changes history.

But when another Rover goes missing in Whitechapel the job becomes personal. Can she trust the two Victorian gentlemen who come to her aid, or do they have their own dark secrets? And who are the Transitives, the mysterious shapeshifters who can alter their identities? Is that magic or something else?

With her employer nearly bankrupt, Jacynda is literally running out of time. But being orphaned in the past isn't the only threat she'll face, not with Jack the Ripper on the hunt.

Unless she can outwit a murderer, her Victorian sojourn will end in the grave.

The revelations on Mars -- a half-million year-old legacy of the vanished star-traveling Builders -- have fed the flames of catastrophic war. A beleaguered United States and its Russian and Japanese allies struggle to hold their own against the indomitable forces of the enemy United Nations. The bloody conflict that has swept over the home planet now rages across the blackness of space -- with the U.S. Marine Corps in the vanguard, leading the charge as always.

But Mars is not the sole repository of alien wonders. The Earth's moon hides unsettling mysteries of its own-and dangerous secrets pointing toward an unstoppable threat advancing from somewhere beyond the solar system. And as scientists on both sides ract to utilize technology they have only barely begun to comprehend, the UN makes the opening move in a gambit that could end the hostilities quickly and decisively by bringing about the death of millions...without the aid of alien-inspired weaponry.

A bad situation worsens by the nanosecond. And that means it's time to call in the Marines -- to make a life or death stand on the gray shores of Luna.