Star Trek: Mirror Universe: Obsidian Alliances

Some say the line between good and evil is narrower than we imagine -- a divide as subtle as a mirror, and perhaps just as deep. To peer into its black, reflective glass is to know the dark potential we each possess, and we cross that obsidian boundary at our peril . . . into a world where we no longer recognize who we are or what we believed ourselves capable of. In the late twenty-fourth century, decades after the fall of the once-mighty Terran Empire, the Klingon-Cardassian Alliance dominates