It was nice to go back to these characters, but I used the audio version for commutes to work and I wish I'd read it myself. The reader is great until she changes her voice tone and pitch for other characters. A new and supposedly strong character sounded like she was 5 and the Commander sounded like he had a severe speech impediment. 
 That said; 
 Great story, lots going on, who can you trust (very few it seems)? We learn a lot about Valek's past and how he became the Commander's right hand man. Lot's of unresolved points too, and the end chapter will have you demanding the next book's release sharpish!