Abyss by Troy Denning

This book picks up the pace on the hunt for what Jacen was up to while he was traveling around the galaxy after the Yuuhzahn Vong war--and hints at an underlying structure that might make sense of Centerpoint, Corellia, Kessel, the Maw, and the Jedi going crazy. The Jedi seem to be figuring out how to cope with Daala (though Hamner seems to be liking his position too much for my taste) and the plot's really picking up. At this point I'm really relieved to see some good, old-fashioned Sith who aren't shadows of their former, beloved selves.