If you are a fan of Supernatural and Buffy, the Vampire Slayer, you will enjoy this book. 
 The story borrows heavily from both shows mentioned above. Cas reminds me of Buffy, except he has accepted that it is his destiny to slay ghosts. (view spoiler)[ He also has a British advisor, lives with his mom, falls in love with one of the "monsters" he is supposed to slay, and mentions more than once that he is the only one in the world who can do what he does. Carmel seemed like a kinder Cordelia. Thomas, the best friend, is a budding witch. There is even a supporting character named Will Rosenberg (though Will is more of an antagonist than a friend). And Anna's evil, powerful form sounds a bit like Evil Willow in a bloody dress. (hide spoiler)] The similarities seemed kind of heavy-handed to me, but Buffy is one of my favorite tv shows, so people who are casual fans or have never seen the show won't care. 
 The good... 
 My favorite part of the book was Anna. She was the most interesting character in the story, and I wanted to learn more about how she was killed and how she became the way she was. The atmosphere of her house was spooky. 
 There were also some creepy moments. I generally don't get chills anymore when I read, (view spoiler)[ but the moment the athame is found in Cas's room and the attic door creeks, I had chills running up my spine. Also, the Big Bad is creepy. When he turns around and his eyes are sewn shut...great imagery. (hide spoiler)] 
 Morfran is a fun character. He steals the scenes he is in. 
 The bad... 
 Not too much to complain about...I wish that Thomas and Carmel had been better fleshed out. As it was, I found Thomas annoying. Other than his talent, I'm not sure what either Will or Carmel saw in him. 
 Additionally, I felt that the ending was a bit abrupt. (view spoiler)[ I was a bit confused about how exactly Anna defeated the Big Bad. (hide spoiler)] But there is a sequel, so I guess I will see how things continue. 
 The Verdict 
 Overall, I really enjoyed the book. I found it a fun read and would recommend it to fans of the shows mentioned above, as well as people who enjoy paranormal romance. I'm looking forward to reading the sequel.