Rebellion 1: My Brother, My Enemy, Part 1

Star Wars Rebellion 1: My Brother, My Enemy, Part 1 was the first issue in the Star Wars: Rebellion series of comics.

Publisher's Summary
Seeking to exploit a fatal flaw in the Rebel fleet’s escape strategies, the Empire plants a sleeper agent in the Alliance’s midst and sets into motion a series of events that will have devastating consequences for Luke Skywalker and his companions. Meanwhile, Darth Vader’s own agenda runs counter to the Empire’s schemes, and he’s ensnared Lt. Janek Sunber to carry out a secret mission that will lead the idealistic Imperial officer straight into the heart of the Rebellion.