You should also check out Aftershock
and Cadet Kirk
, books 2 & 3 of the Academy trilogy from the 90's. Book 1 is solely about Spock, but then 2 (Aftershock
) introduces McCoy and we see just how McCoy and Spock react without Kirk in the mix (although Kirk is still the catalyst for the plot of the story, but it's in a very brief cameo). Kirk doesn't play an important factor til book 3, at which point you can see the mix coming into place between the three characters.