First of all I loved the first book in the series and read as soon as it was released, so the year wait for this book was agonizing!
It started directly where the last book finished, which was a total cliffhanger, so I was really pleased that I didn't have to wait to find out what happened. You know how these authors like to tease you with flashbacks etc sometimes!!
The story progressed really well and threw in lots of twists and turns and really had you rooting for the kids.
I have two negatives, although they aren't really negatives when I look at them. I just wish more had happened, I wanted answers and for them to get some revenge/closure before the next round of rubbish they had to deal with got dumped on them! The second part is I want the next book to be released soon so I dont have to wait too long but unfortunately that's not happening

Overall fab book and series def worth a read. Oh and I think its more beneficial to read the Darkest Powers trilogy before this as that is referenced a fair bit! I didn't and read Darkest powers between book one and two and I picked up on the references to the other group of kids covered in the Darkest Powers trilogy that I had previously missed!