“Provenance of Shadows” is the first of a new trilogy of Star Trek original series books by David R. George III, each centering around the three main characters, McCoy, Spock, and Kirk.

In his foreward George says he had a problem adding something new to all the TV shows, movies, and books already written about these characters. Instead he looks at their entire lives, but with a crucial point of departure, the events of the TV episode “City on the Edge of Forever”.