James H. Schmitz 
The Winds of Time [EPUB ebook] 

This is a classic science fiction short story by James H. Schmitz and illustrated by Brotman. The following passage is part of its intriguing intro:
‘He contracted for a charter trip—
but the man who hired his spacer wasn’t quite a man,
it turned out—and he wanted more than service!’
This work is part of our Vintage Sci-Fi Classics Series, a series in which we are republishing some of the best stories in the genre by some of its most acclaimed authors, such as Isaac Asimov, Marion Zimmer Bradley, and Robert Sheckley. Each publication is complete with a short introduction to the history of science fiction.