I have to say that Nenia Campbell created one of the most chilling fictional characters I've read in recent memory, and as a bonafide horror fan, that is saying something.
This series started with Val, a young girl being mentally terrorized by Gavin, a strange young man. He later found his way back to her and set a ghastly game in motion, claiming the lives and sanity of those who he saw as being in his way to get to Val, who he saw as his to possess.
The ending of this series feels a bit disjointed, but it has a great pace as it keeps you interested and wanting to read more. The ending is bittersweet, and I'm not sure if I'd call it satisfactory...definitely strange.
Campbell is quite good at keeping the reader intrigued, but ultimately I didn't enjoy this as much as I did the second installment in the series (or either of the IMA books). Still, if you've read the first two, it's pretty much a given that you have to read this one, otherwise not knowing how the story ends might drive you nuts. Bear this in mind, however - it is not for the faint-hearted.