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 Youtini Expanded Universe Ranking system is a 1-5 scale that ranks EU book quality, difficulty, and importance. Books closer to Level 1 are easier to read and understand, more important, and of higher quality.
Deadly assassin X-7 has infiltrated the Rebel Alliance. Trained by ruthless Commander Rezi Soresh, X-7 is the best there is: he feels nothing and sees everything. Now, he's gunning for the ultimate prize: Luke Skywalker, the pilot that destroyed the Death Star.
The seemingly clueless kid from Tatooine proves more resourceful and difficult to eliminate than X-7 could ever have imagined. Surrounded by friends and allies, and with a connection to the Force that grows stronger every day, Luke seems all but impervious to the usual tactics.
But X-7 isn't done with him yet. This time, he knows how to bring Luke down. He'll shatter the trust that holds the Rebel Alliance together—and manufacture the ultimate betrayal.