The Curse of Mickerson

Jenna Mickerson has always felt strange.  She can't skip, literally, she can't sing, her voice is almost unbearable.  And she can't jump.  She can never leave the ground completely.  Janna hates it.  One day, after school, Jenna sees a strange boy spying on her.  Over the next few days, she sees him constantly, and she is almost positive he is not just an annoying boy.  Jenna learns that she can't jump, skip, etc. because of a curse, and she must break it.