If you like the books of mystery and magic, then, this is your book.
It is about a girl, called Dana. She lives in a farm with his family. One day, she found a ghost that no one else can see, called Kai. At the first moment she was scared, but later, the make best friends.
Later a man came into the farm that want to take Dana to a school in the valley of the wolves, but what Dana didn’t knew, is that the school was of magic.
If you want to know how it ends, you will have to read the book.
I recommend it to people from 10 years old to 14 because it is a great book. And I also recommend the others 3 books of the collection: “La maldición del maestro”, “La llamada de los muertos” and “Fenris, el elfo”