When I say biography book, I don't mean that it follows the subject through each and every moment of his entire life, any more than a biopic film documents its subject's every day. It's not a nonfiction biography. But tell me, what is the narrative of Darth Plagueis? It's the story of . . . what? How he became a Sith Master (and via flashback and infodump, how he became a Sith Apprentice), found his apprentice, achieved a few significant events over the course of his life, and plotted for his ultimate seizure of power only to be overthrown by his apprentice? It's the story of Plagueis's life. It is biographic in ambition and scope. It's not a single, focused narrative about one set of events, about a battle or a war or a personal crisis or the foiling of a plot or anything else novels are normally about. It's a loose, sprawling chronicle of most of the highlights of Plagueis's life, the only unifying narrative being the arc of his entire life. That right there is biographic fiction.