The Jedi-Bendu were the personal bodyguards for the Emperor for 100,000 years until they 'rebelled' at some stage and the former regime was restructured into a New Empire. The Knights of the Sith have hunted down and eliminated almost all the Jedi.
So far so good right?
Now, Alderaan is a city floating around a gas giant and is the seat of the New Empire;
Luke Skywalker is a seasoned Jedi and military man in his 50s who serves as the appointed protector of
Aquilae, the last independent system in the Galaxy; which the Emperor, a lean and imposing man has his sights on conquering despite ongoing peace negotiations.
Aquilonian (?) spy
Clieg Whitsun is on Alderaan when the Emperor gives a public speech announcing his intentions to his military force and ministers, and rushes to meet the trader
Bail Antilles looking for transport home to warn King Kayos of the imminent invasion.
Darth Vader is the Emperor's most trusted general, an imposing man and decidedly non cybernetic man that quickly dismisses any notion that the Jedi Bendu still exist.
In the middle of all this Kane Starkiller and his sons Annikin and Deak are attacked by a Knight of the Sith while living in exile on the fourth moon of
Utapau in the
Kissel system, the outcome is most bittermaking Kane decide to head back to Aquilae and meet his old friend Skywalker to ask Luke to finish Annikin's Jedi training...
Their reunion is interruped with news that a large mass is heading straigtht for Aquilae ... it seems Luke's fears that negotiations with the New Empire were going sideways are quite real...