The crew of the U.S.S. Enterprise journeys to the heart of the Klingon Empire where Captain Kirk's last surviving relative has become a pawn in a battle to divide and conquer the Federation. With Sarek's help, the crew of the Starship Enterprise learns that all is not as it seems. But before they can prevent the Federation's destruction, they must see the face of their hidden enemy, an enemy more insidious and more dangerous than any they have faced before.
©2000 A.C. Crispin; (P)2008 Simon & Schuster Audio
"Great Read"
Mark Lenard (who plays Sarek in Star Trek) does an outstanding narration on this story. The audiobook is definitely abridged but still an enjoyable 3 hours or so.