I loved this book! it was amazing! I would recommend it for maybe 12 or 13 years and up. 11 may be pushing it! It all depends on how scared your child is of ghosts and other supernatural beings. It can be a little gruesome in descriptions at times. Other than that, I would highly recommend it!
I really liked this book and the others in the series. It touches on some of the things that kids really worry about, like not fitting in, taking medication for a disorder (the am i really crazy idea) having a crush and so on. I really like the characters because they are so well developed, and they create such a good mix. There were a few gruesome parts describing the ghosts that Chloe sees. And the fact that there was some references to making out, but if you have been around teens or turned on the TV after 7 pm it is nothing that should bother you. Like everything I think that it depends on the reader. Parents preview it, if you think that it is too graphic, or don't like the content, then don't get if for your kids. But it is a really good book, my 11 year old fights me for Kelly Armstrong's novels when we find them.