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.
Doctor Aphra may be in Imperial prison, but she's certainly not alone. Rumors have it that these bars are haunted, but this rogue archaeologist knows there's something much more valuable going on. Meanwhile, Aphra's got information - information that the Rebellion wants. But how far are they willing to go--and who are they willing to recruit – in order to get it?