I liked the concept and the characters, but things just continued to creep in that kept me from really liking it.
The worldbuilding was tighter than the last few books I have read that deal with angels, death and "protectors" of those related to either of those things. Sixteen year-old Meridian is a Fenestra, a half-human, half-angel being whose purpose is to be a conduit for dying souls to pass through her into their afterlife. Without her kind, the souls are either trapped in a cycle of rebirth or their energy/soul is stolen by the Aternocti and sent to ... hell/Hades/underworld, thus strengthening the baddies. Of course, Meridian has never been told any of this and believes that all the dying animals that seek her out and her strange maladies, her horrendous health and freakishly small stature and growth is due to her being a freak. Hmm, great parenting there. Can't see any problems down the road. At all. And her parents treated her like a leper and then later in the book they act as if they loved her so much and just did not want to burden her with the truth until she was older. Ok, fine, don't tell her about the Fenestra, but don't treat her as if she frightens you and certainly don't allow her to live her life as if she was the cause of all those dead things. Gah! Really poor parenting. So, needless to say, bad things are out to get Meridian and she is suddenly separated from her family and shipped off to her Great-great-aunt Meridian's in Colorado. Great-aunt, or Auntie, was sweet and cryptic and just a tad stereotypical, but I liked her story. Tens, Meridian's Protector and love interest, was not poorly done, as such, but their romance was. There was neither enough time nor sufficient knowledge of each other for them to be in love by novels' end. Things rushed along with the psycho preacher setting the all-too gullible townsfolk after Auntie and Meridian, denouncing them as witches and associates of demons and now Auntie is dead, the preacher vanquished by an angel, a Sangre, and Meridian and Tens are on their own, off to find other Fenestra.
I like the premise, but found it underdeveloped and lacking a certainty gravity and realism that would have grounded it more firmly. Instead, it felt hurried and squashed together.