Celeste Morne, a Jedi of the Old Republic, and Cade Skywalker, descendant of the legendary Skywalkers, have joined with a group of Imperial Knights and Cade's bounty-hunter crew for an assassination attempt on the Sith Emperor, Darth Krayt. But Celeste has been struggling with the spirit of Sith Lord Karness Muur for over 4,000 years-there is no way to determine how much control he maintains over her actions. Can Cade's plot succeed, or will he find himself at the mercy of another Sith?