Star Wars - Jedi: v. 1: Dark Side by Scott Allie
Twenty-one years before the events in Star Wars: Episode I The Phantom Menace, Jedi Master Qui-Gon Jinn is dispatched to prevent the outbreak of a civil war on the homeworld of his Padawan Xanatos - whose father is king. It is a mission that will lead Qui-Gon into close contact with the dark side and start him on a quest that will have a major impact on the future of the Jedi Order.