A disappointing read. I guess I deserve it for not reading the synopsis.
I was expecting something truly new. I mean, it's okay for the plot to pick up slightly earlier than where the last book ended off, but this is ridiculous: It's just a rehash of book #3 with an annoying faux-teen voice that really doesn't work. :
Given the quality of the first three books, I expected much more from this one. Feel free to skip this one -- I wish Scalzi would not have given it to the temptation of adding yet another volume to the series, or better yet, had taken the time to create something truly new.