I think I might have enjoyed this more had I read the previous books in the series. I own them but I needed a book set in Peru so I grabbed this one first. I like characters who channel the dead and Natalie was a very likable person. Even without knowing her back story, I felt bad for her situation with the Agency and poor Callie, her nightmares are horrific. I liked the concept of the Violets and disliked the Agency. The villain Nathan was a horrible person and I cheered when he met his fate. At some point I will read the first two books in this series as the writing is good and the Violet concept is interesting and different.