"Book 2: Forbidden to intervene in Jedi affairs, Luke is on a desperate mission to uncover the truth behind Jacen's fall to the dark side and to learn what's turning peaceful Jedi into raving lunatics."
"Book 8: Luke Skywalker, his son Ben, and the Sith girl Vestara are in hot pursuit of the dread power called Abeloth, who has joined forces with the Sith in a bid to take over the galaxy. The leadership of the government is uncertain, torn apart by power struggles and infiltrators, while the Sith have a terrible secret that could shake the Jedi Order to its core."
"Book 9: Jedi and Sith face off - with Coruscant as their battlefield. For the Sith, it's the chance to restore their dominance over the galaxy that forgot them for so long. For Abeloth, it's a giant step in her quest to conquer all life everywhere. For Luke Skywalker, it's a call to arms to eradicate the Sith and their monstrous new master once and for all."