I was holding out for the audio version, because that's how I read book 1. However, I couldn't find it and so in the end I just bought it on kindle. 
 In some ways, I think this was actually better than the first book. The first one held me because they were constantly trying to figure out what was happening, this book, less so. However, it was filled with action from start to end. I began to really like a character who had irritated me in book 1. 
 I hope there is more, I read at the end that there is, so I guess i'd better go looking for it.