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.
A Star Wars adventure set between "A New Hope" and "The Empire Strikes Back". When an Imperial power-play lands an Imperial officer in the H'drachi Ghetto, Princess Leia's Rebel forces fear the worst, until the officer's loyalties are swayed by the barbarity of the Imperial retaliations.