Twilight Serenade. Earth Song, #6

The Galaxy is Not a Safe Place! More than five hundred years after Earth's destruction, the descendants of humanity's survivors are finally coming into their own under the leadership of First Among the Chosen Minu Groves. They've gained allies and slowly built their strength, and now Minu has decided the time has come to make their bid for freedom from the Tog, humanity's sponsors in the interspecies Concordia. The Higher Order species have fleets of starships they can use to enforce their iron will, though, and to leave humanity helpless against them isn't acceptable.
Minu knows, however, that there are several ghost fleets hidden in the deep recesses of space-remnants of the Lost's ancient armada from an eons-ago war-and if those ships could be found and reactivated, they might provide the defense her people need. While the ships could be the final piece Minu needs to permanently ensure humanity's freedom, the other species have plans of their own, and the greater mysteries of her own history, her husband's fate, and the very nature of the Concordia may prove to be her own undoing.and with her, all of humanity.