I just finished the audiobook this morning and must say...[no spoilers]
Bloodline is what Aftermath should have been! This book should have been released before TFA hit screens. It is a great lead-in book. It sets up the geopolitical status wonderfully without being a spoiler for the movie. There is still a lot to learn about in the 6 years between the book and TFA, but the book does enough to setup TFA that we could even wait longer for those in between stories.
I, personally, think that I would have liked TFA much better had I read Bloodline before seeing the movie. Certain scenes would have been much more powerful and meaningful had I read the book first.
These comments may be considered spoilers, so I'll hide them...
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I find that my only disappointment with Bloodline is learning that Leia never did any jedi training. Before, I had thought that Leia may have done some jedi training with Luke until things went south with Ben...when she would have "gone back to what she knew best" (or whatever she told Han in the movie). But now we know that never happened. *sigh* I thought that at least with the legendification of the EU that they could correct some things that weren't done right in the EU...one being Luke not training Leia until years later. *shrug* oh well.
Ms. Gray did a wonderful job of making me dislike a certain character, then like the character, then dislike the character, and then end up liking the character. Bravo!!! I really hope that they have her write more books post-RotJ!