This is the third book in the Lightbringer series. I had hopes this would be the final book, but it seems there is at least one more in the series. It felt like a build up for the (hopefully final) fourth book. The first book established the characters. The second book had them at a loss, so I thought the third book would see them triumph. Not so, they seemed to be even worse off at the end of this book (especially the Prism). I give this book 4 stars.