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.
Ex-Jedi Ferus Olin has been imprisoned by the Empire. His crime? Trying to save the Jedi Order. The sinister Empire won't be able to hold Ferus for long—not when he has a friend on the inside. But escaping is only part of the problem. Ferus's quest is going to take him to the planet of Naboo, where a secret vital to the survival of the Jedi and the entire galaxy is being kept…and is in danger of being revealed.