Enemy sleeper agents of the Undine, a paranoid, shape-shifting race, quietly penetrated every echelon of Federation society and other civilizations throughout the Alpha and Beta quadrants. The ensuing conflict shook humanity to its very core, often placing its highest ideals against a pure survival instinct. Prize-winning author Jake Sisko's "living history" of the 25th century, compiled from the recollections of key figures who served as eyewitnesses, illuminates an age marked indelibly by both fear and courage.