Atomic Hideout, Episode 1-4: Flight From Tomorrow, Chapter 4

Flight from Tomorrow

Hunted and hated in two worlds, Hradzka dreamed of a monomaniac's glory, stranded in the past with his knowledge of the future. But he didn't know the past quite well enough....

Written by H. Beam Piper
Narrated by Brad Grochowski
Originally published in 1950 in the popular science fiction magazine, Science Fiction Stories.