Devil's offspring

From a letter by Claire Bailey to Father Avery Smith: "I am asking for your help yet again, holy father... Or rather, not asking, but begging you! More than ten years have passed since our father's death... My sister Laura's bouts of violence have started up again. A few days ago, she assaulted me severely and attacked our neighbor with a knife. Her eyes are sometimes white, sometimes filled with blood... Sometimes I look at her, and it's as if a million worms are crawling underneath her pale skin... Sometimes, she suddenly jumps up and bends on the bed like a madwoman during the night! I am very afraid that she will soon kill me and everyone else who's around. There is no way out... We have to perform that dreadful rite again."