New York Times bestselling author Harry Turtledove brings his post-apocalyptic disaster trilogy to a startling conclusion... An explosion of incalculable magnitude in Yellowstone Park propelled lava and ash across the landscape and ...

The Soviet Union won the Cold War. The Russians were a little smarter than they were in our own world, and the United States was a little dumber and a lot less resolute. Now, more than a century later, the world's gone Communist, and ...

Usually Crosstime Traffic concerns itself with trade. Our world owns the secret of travel between parallel continuums, and we mean to use it to trade for much-needed resources with the worlds next door. Preferably without letting th...

The New York Times bestselling master of alternate history further explores what would have happened had Hitler been forced to start World War II earlier than he did, in this sequel to Hitler's War.

LEAP INTO THE FUTURE, AND SHOOT BACK TO THE PASTH. G. Wells's seminal short story "The Time Machine," published in 1895, provided the springboard for modern science fiction's time travel explosion. Responding to their own fa...