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.
The Sith Empire has rallied its forces for an all-out battle for control of the galaxy. Its goal: Crush the Republic. And with so many Sith Masters among them, the goal is not unachievable. As Naga Sadow readies his fleet to attack, one lone person threatens to undermine the entire campaign — Jori Daragon. She isn't a Jedi. She's an explorer, a mapper of hyperspace who stumbled on the plans of the Sith. And she just may be the savior of the Republic.