On February 10, 2017, there was a sentencing hearing for murder in the Victorian Supreme Court. The young woman in the dock, who sat quietly with her hands in her lap, had pale skin and light-brown hair tied back as neatly as a private school prefect's. When the judge asked her to confirm her plea, the young woman answered in a clear and polite voice. "Guilty, your Honor." That killer is Mary Pershall's beloved daughter, Anna. She is 28 years old,...