Star Trek: The Wounded Sky by Diane Duane

Paperback. Condition: Good+. 1983. Pocket Books. 1st Edition, 1st Printing

An alien scientist invents the intergalactic inversion drive, an engine system that transcends warp drive – and the USS Enterprise will be the first to test it! The Klingons attempt to thwart the test, but a greater danger looms when strange symptoms surface among the crew – and time becomes meaningless. Now Captain Kirk and his friends face their greatest challenge – to repair the fabric of the universe before time is lost forever.