All my friends are ghosts

"Effie runs away from home and discovers a ghost school in the nearby woods. But just as she's beginning to learn all about the amazing things that ghosts can do -- like possession, poltergeist-ing, demon magic and more -- Effie is asked by her new friends to help track down a mysterious spirit that's been spotted. But if Effie's going to succeed, she'll not only have to show her friends that she's got something special, but also learn to believe she's got it too"--Amazon.