The Final Nexus (Star Trek #43)

Uncounted centuries ago, an unknown race from beyond our galaxy built a series of interstellar gates — shortcuts through the cosmos — and then disappeared, leaving no clues to their identity nor to the workings of their system. The “EnterpriseTM herself has used the gates twice before, without gaining any insight into the mystery. But now the secret of the gates must be solved, because they are disintegrating, cutting distant parts of the galaxy off from each other, and the “Enterprise’s only hope lies in communicating with creatures from another universe altogether.

The interstellar gate system discovered by the U.S.S. Enterprise is breaking down–and creatures from countless dimensions are pouring into our universe! Captain Kirk and his crew face one of the greatest challenges of their careers. Can they repair the rift between the universes before it is too late?