Time for Yesterday

by A. C. Crispin

Published 1 April 1988
Time in the galaxy has stopped running in its normal course. That can mean only one thing -- the Guardian of Forever is malfunctioning. To save the universe, Starfleet Command reunites three of its most legendary figures -- Admiral James T. Kirk, Spock of Vulcan, and Dr. Leonard McCoy -- and sends them on a desperate mission to contact the Guardian, a journey that ultimately takes them 5,000 years into the past. They must find Spock's son Zar once again, and bring him back to their time to telepathically communicate with the Guardian. But Zar is enmeshed in troubles of his own, and soon Kirk, Spock, and McCoy find themselves in a desperate struggle to save both his and their world.

Yesterday's Son

by A. C. Crispin

Published 15 August 1988
The Romulans attack the planet Gateway, where Federation scientists are studying the Guardian of Forever -- the mysterious portal to the past.
The Starship Enterprise™ must protect the Guardian -- or destroy it. But Spock has already used the portal to journey to the past. On the planet Sarpedion, 5,000 years ago, Spock knew a beautiful, primitive woman. Now he has gone back to meet his son!

Sarek

by A. C. Crispin

Published 1 March 1994
The novel begins after the events of STAR TREK VI: THE UNDISCOVERED COUNTRY. Spock's mother, Amanda Grayson, is dying and Spock returns to the planet Vulcan where he and Sarek enjoy a rare moment of rapprochement. But just as his wife's illness grows worse, duty calls Sarek away--once again sowing the seeds of conflict between father and son. Yet soon Sarek and Spock must put aside their differences and work together to foil a far-reaching plot to destroy the Federation--a plot that Sarek has seen in the making for nearly his entire career. The epic story will take the crew of the U.S.S. Enterprise to the heart of the Klingon Empire where Captain Kirk's last surviving relative has become a pawn in the battle to divide the Federation...and conquer it. With Sarek's help, the crew of the Starship Enterprise learns that all is not as it seems. 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...