Lords of the Sith

I really liked this one! This was my first new canon book set closer to the prequel trilogy than the original trilogy, and I loved that the Empire and its characters were at the center of it. It's set around 8 years after Revenge of the Sith, so both Darth Vader and the Emperor aren't all that known in all parts of the galaxy, so these people think they can take on Vader (and the Emperor) and have no idea they're doomed.
I also liked the other things that were going on. Mors and Belkor were both great characters, and at times I had no idea whom of them I wanted more to survive (though I definitely made up my mind by the end). The Twi'lek stuff was interesting as well, though I didn't particularly care about their characters. But their point of view was interesting.
I have yet to see the Star Wars: Rebels series, but knowing Cham's daughter is in it (and he might show up at one point), made me want to start it even more.