Shadow Academy (Star Wars: Young Jedi Knights, #2)

Driven away from Luke Skywalker's Jedi academy for pursuing the Dark Side of the Force, former student Brakiss, the student Luke Skywalker expelled from his academy, has learned much since he left. Enough to master the dark side of the Force, and enough to establish his own school for training Jedi, the Shadow Academy. Now Dark Jedi Brakiss has an even greater task, to kidnap the Solo twins, heirs of the Skywalker bloodline, and turn them to the dark side of the Force.