On Earth, six million B.C., two species of alien ruled, the graceful humanoid Tanu and their twisted brethren, the Firvulag. Then men from twenty-second century

Second in the series that portrays “one of the best-thought-out futures ever encountered in science fiction” from the author of The Many-Colored Land (Joe H

In the final novel of the award-winning sci-fi saga, both humans and aliens face destruction as a new time-portal opens a path back to the twenty-second century

In the year 2034, Theo Quderian, a French physicist, made an amusing but impractical discovery: the means to use a one-way, fixed-focus time warp that opened in

The author of the acclaimed Pliocene Quartet offers an in-depth guide to a saga that “has most closely matched J. R. R Tolkien's achievement” (San Francisco