Traitor : Star Wars (the New Jedi Order)

After the capture of Coruscant by the ruthless Yuuzhan Vong, Jacen Solo finds himself in the care of Vergere, an enigmatic being and master of inscrutable arts, who holds the key to teaching the young Jedi powerful and dangerous new aspects of the Force, but, unbeknownst to Jacen, others are watching his progress closely, waiting to use his powers