BBY/ABY is used to position items along the Star Wars Timeline. BBY refers to Before the Battle of Yavin. ABY refers to After the Battle of Yavin. The Battle of Yavin in Episode IV: A New Hope occured in 0 BBY/ABY.
When a ship full of Sith warriors arrived in Galactic Alliance space, the fight to destroy it accidentally uncovered a hidden menace: a long-hidden group of clones, secretly created as insidious weapons capable of wielding the Force and heedless of the differences between light side and dark side. Now the clones have escaped—and evidence suggests that they are flawed by genetic disease and violent madness.
Jedi Knight Jaden Korr pursues the clones, hoping to heal them but prepared to destroy them. What he doesn’t know is that Sith agents are hot on his heels, determined not only to recover the clones for their Master but to capture Jaden for their own dark-side purposes. In a life-or-death battle, Jaden will confront a shocking reality that will rock him to his core and bring him face-to-face with the question of what makes a man . . . and a Jedi.