The Voyage Home (Star Trek: The Original Series Film Novelizations)

At last, Admiral James T. Kirk and the crew of the late starship Enterprise begin the long voyage home.

But their trip is interrupted by the appearance of a mysterious, all-powerful intruder. Suddenly, Kirk, Spock, McCoy and the rest of the crew must journey back through time to twentieth-century Earth. For only there can they save the future - by rescuing the past.