I downloaded a sample of a free book in the ITunes Store. I'm trying to delete it from my Ipad, but for some reason every time I open IBooks, the sample opens right up and I can't get it to close. I have restarted the Ipad and cleared all running apps. Any ideas? I even synced to my Mac to see if it were on there to delete, but it's not. As of right now I can't get to any of my other EBooks.