Fractured history. Broken lives. Splintered souls. Since the alternate universe was first glimpsed in the classic episode "Mirror, Mirror," something about Star Trek's dark side has beckoned us, called to us, tempted us -- like forbidden fruit on the Tree of Knowledge. To taste it is to lose oneself in a world of startling familiarity and terrifying contradictions, where everything and everyone we knew is somehow disturbingly different, and where shocking secrets await their revelation.

What began in 2007 with Glass Empires and Obsidian Alliances -- the first truly in-depth foray into...