Friend's Email: Subject:I have found a book that I think you would enjoy
The Crossroads of Time / Mankind on the Run (Classic Ace Double, D-164)
The Crossroads of Time / Mankind on the Run - Classic Ace Double, D-164 Author:Andre Norton, Gordon R. Dickson THE CROSSROADS OF TIME — By Andre Norton — If you knew something evil was going on, you'd try to stop it-wouldn't you? That was what Blake Walker figured when he butted in on the attempted murder of a Time Patrolman. In his haste, Blake forgot that the technique he had used was not of this world, but neither the rescued man nor his attacker failed... more » to notice.
That made Blake the A-1 priority subject for both the mysterious patrol and their unearthly enemies. As a result, it was not long before their emergency tactics had Blake playing chute-the-chutes among alternate Earths. This is VERY early Norton; great stuff!
MANKIND ON THE RUN
By Gordon R. Dickson
It was a future in which the law compelled four billion people to be constantly on the move. For Kil Bruner it was the best of all possible worlds. He held Class A citizenship, and his Key made every good thing in this rigidly controlled world run by a gargantuan computer simply referred to as "Files" available to him.
Until one night, when a strange visitation snatched his wife Ellen away from him before his very eyes, and no one would help him find her!
"Files" ignored his requests, hunted him instead, condemned him to move every twenty-four hours. Somewhere in the maddening unknown, Ellen was being held captive, key to a secret so fantastic that its seekers would destroy the earth in order to learn it. Kil then knew that his dangerous mission was more than personal-it was universal dynamite!« less