"It wasn't technically an exorcism, what they did to Clare. When the reverend and his son ripped her demon from her, they called it a "deliverance." But they didn't understand that Clare and her demon--known simply as Her--were like sisters. She comforted Clare, made her feel brave, helped to ease her loneliness. They were each other's Only. Now, Clare's only comforts are the three clues that She left behind: Be nice to him; June 20; Remember the...