I enjoyed this book, it was a really quick read. The concept of it is not new, Good Girl + Bad Boy = Eternal Love. But somehow, this idea is never getting old for me, no matter how many books I read. 
 Anna is quite a likable character, if a bit too sweet and innocent. But I can actually relate to her and other girls like her, because I was very much like them at the age of 15-17. So she is realistic to me. 
 Kaidan is practically an incubus in a not-so- human disguise. One can almost say he is bad against his own will. Kind of reminds me of Georgina Kinkaid from Succubus Blues by Richelle Mead. 
 Beware, there is a hint at a possible love triangle in the next installment :) 
 The paranormal element is interesting. The plot moved along at a good pace, but some things that happened were just too convenient for my taste. Ann is not a badass protagonist (yet?), so don't expect epic battle scenes in this book, it is mostly just about emotional turmoil of a teenage girl who has to deal with a lot of knew knowledge about her heritage and her first (forbidden) love.