Requiem Of Stars

Description for REQUIEM OF STARS by Tracy Hickman:

On silver wings they sail the darkwind between uncounted worlds, the ships of the Pax Galacticus, rulers of the galaxy.  Their journeys are mostly routine.  But when a rebel privateer ambushes the Pas frigate Shendridan, First Master Serg Dresiv finds himself in charge of a stricken vessel, a decimated crew, and a complement of rebel prisoners---including their dunning and heartless commander, the beautiful but deadly Thayne Haught-Cargil.  As Serg struggles to save the ship and bring the rebels to trial, Thyne plots her escape and the destruction of the Shendridan.  Until they all come face-to-face with a massive armada of unknown origin and terrifying power---and Serg and Thyne suddenly find themselves reluctant allies in a desperate battle to save humanity.

This is #1 in Songs Of The Stellar Wind Series.