Seasons of Light and Darkness
Seasons of Light and Darkness is a Pocket TOS eBook novella written by Michael A. Martin. Published by Pocket Star Books, it was first released in . 

The novella is set during the events of , and focuses on the character of Leonard McCoy.

Summary 
From the book jacket
An original Star Trek e-novella set in the Original Series universe, taking place prior to the events of the feature film The Wrath of Khan.

Background information 
 Cover design by Alan Dingman.

External link 
 

eBooks