Star Trek Terok Nor #3: Dawn of the Eagles by S. D. Perry
Before the Dominion War and the decimation of Cardassia...before the coming of the Emissary and the discovery of the wormhole...before space station Terok Nor became Deep Space 9™...there was the Occupation: the military takeover of an alien planet and the violent insurgency that fought against it. Now that fifty-year tale of warring ideologies, terrorism, greed, secret intelligence, moral compromises, and embattled faiths is at last given its due in the three-book saga of Star Trek's Lost Era...
As violence all across Bajor continues to escalate, Cardassian forces tighten their grip on the captive planet, driving back the resistance at every turn; but on Terok Nor and elsewhere, the winds of change are stirring -- the beginnings of a hurricane that will alter the landscape of the Occupation. And while secret dealings, shifting alliances, and personal demons buoy the wings of revolution, a mysterious shape-shifting life form begins a journey that will decide the fate of worlds.