Junior Jedi Knights: Vader's Fortress

Junior Jedi Knights: Vader's Fortress is a series of Star Wars Legends young adult novels written by Rebecca Moesta. The story takes place 20 years after the events of Star Wars: Episode IV - Return of the Jedi. The series follows the adventures of Jedi Knight Luke Skywalker's son, Jacen Solo, and his best friend, Tenel Ka. In Vader's Fortress, Jacen and Tenel Ka are sent on a mission to the remote planet of Vjun to investigate a strange energy source emanating from an ancient fortress. However, they soon discover that the fortress is actually the stronghold of the late Darth Vader, and that it is guarded by a legion of deadly droids programmed to kill all intruders. With danger at every turn, Jacen and Tenel Ka must use all their Jedi training and knowledge to uncover the secrets of Vader's fortress and complete their mission.