I really liked the story about Cassie's armour and the interaction of her, Conner and Tim, but the other storyline suffered for having crossed over with Legion Lost and suddenly increased its cast. It's annoying having to get a book you're not collecting to fill in gaps, but I'm guessing that bit makes more sense if the missing 'chapter' is read first. 
 Cliffhanger of an ending that ties nicely into the Death of the Family storyline.