I finally get the background I have been wanting. Volume four takes us back in time where we find Erica and the first monster she ever encountered. We find her mentor who welcomes her into the society as well as all the missing information we have needed about the society. It’s inner workings, the masks, the colors, all of it.  Out of all the books in the series, this one went by the fastest. I’d be interested in knowing where Erica‘s mentor and her “brother” are now. Overall, I continue to love this story and I’m very thankful I have book number five to get me going next.