Killing Time by Della Van Hise
A Romulan time-tampering project leaves the Enterprise (and the rest of the galaxy) in an alternate dimension, where Kirk is an embittered young ensign and Spock is a besieged starship commander. Together they race to escape the plotting Romulans and return to their original timeline, before the unforeseen effects of the Romulan project destroy the galaxy.
A Romulan time-tampering project leaves the Enterprise (and the rest of the galaxy) in an alternate dimension, where Kirk is an embittered young ensign and Spock is a besieged starship commander. Together they race to escape the plotting Romulans and return to their original timeline, before the unforeseen effects of the Romulan project destroy the galaxy.