Book excerpt: On June 22, 1954, teenage friends Juliet Hulme-- better known as bestselling mystery writer Anne Perry-- and Pauline Parker went for a walk in a New Zealand park with Pauline's mother, Honorah. When Honorah Parker was found in a pool of blood with the brick used to bludgeon her to death close at hand, Juliet and Pauline confessed to the killing. Their motive: a plan to escape to the United States to become writers, and Honorah's determination to keep them apart. Graham offers a brilliant account of the crime and ensuing trial and shares dramatic revelations about the fates of the young women after their release from prison.