In a new spirit of detente, Murdock and his new wife Eveleen Riordan join with the Russians to track down a group of missing scientists on a planet in the past.
Moments later the ground seemed to shake slightly: an illusion, Ross knew, a response of the mind to the distorted probability waves sweeping out from the apparatus as it catapulted the two agents into the distant past.

Variants

(1)
  1. Echoes in Time by Andre Norton and Sherwood Smith (Tor Books, November 1999).
  2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Andre Norton