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 have 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 say mad, others allege dangerous--scientist who seems to have vanished. Sifting through...

Kit Livingstone met his great-grandfather Cosimo in a rainy alley in London where he discovered the truth about alternate realities.

Now he's on the run—and on a quest—trying to understand the impossible mission he inherited from Cosimo: to restore a map that charts the hidden dimensions of the multiverse. Survival depends on staying one step ahead of the savage Burley Men.

The key is the Skin Map—but where it leads

...

"The Pursuit of the Pankera is one of the most audacious experiments ever done in science fiction by the legendary author of the classic bestseller Starship Troopers. Robert A. Heinlein wrote The Number of the Beast, which was published in 1980. In the book Zeb, Deety, Hilda and Jake are ambushed by the alien "Black Hats" and barely escape with their lives on a specially configured vehicle (the Gay Deceiver) which can travel along various planes of...

A groundbreaking revision of the Copernican principle Though the concept of the universe suggests the containment of everything, the latest ideas in cosmology hint that our universe may be just one of a multitude of others--a single slice of an infinity of parallel realities. In The Copernicus Complex, the renowned astrophysicist and author Caleb Scharf takes us on a cosmic adventure like no other, from tiny microbes within the Earth to distant...

The third novel in Terry Pratchett and Stephen Baxter's Long Earth series, which Io9 calls a brilliant science fiction collaboration.-- 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 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...

Alistair's entry in a science competition takes him to many places and time periods, but unfortunately he can't prove this to the judges.

"All it takes is one hit on the football field, and suddenly Ash's life doesn't look quite the way he remembers it. Impossible though it seems, he's been hit into another dimension--and keeps on bouncing through worlds that are almost-but-not-really his own. The changes start small, but they quickly spiral out of control as Ash slides into universes where he has everything he's ever wanted, universes where society is stuck in the past...universes...

"The award-winning creator of The Invention of Hugo Cabret presents the story of two people bound to each other through time and space, memory and dreams, as they try to solve a mystery of grief and love"--

Haunted by visions of spirits and ghosts, Watanuki Kimihiro's adventures begin when he meets a mysterious witch named Yuuko who claims she can help him with his problem and then tricks him into working in her very unusual little shop.

After being kidnapped by Mr. Chu, Atticus Tick Higginbottom and his friends Paul and Sofia must survive a series of tests in several different Realities.