Prime Directive (novel)

Summary
From the back cover: Starfleet's highest law has been broken. Its most honored captain is in disgrace, its most celebrated starship in pieces, and the crew of that ship scattered among the thousand worlds of the Federation...

Journey with Spock, McCoy, and the rest of the former crew of the Starship Enterprise to Talin - the planet where their careers ended. A world once teeming with life that now lies ruined, its cities turned to ashes, its surface devastated by a radioactive firestorm - because of their actions. There, they must find how - and why - this tragedy occured...and discover what has become of their captain.