Author:  Mack Reynolds

Published:  1968

Publisher:  Atria

Number in Series:  0

Time frame:  During The Original Series.

From Amazon.com:

“A mission to a primitive planet suffering raids from its high-tech neighbors leads Captain Kirk to investigate its inhabitants, who are split into two kinds: real people and clones with no civil rights.”

This was the first book about Star Trek.  Tell us your thoughts about it.