In 1991 Sture Bergwall, a petty criminal and drug addict, botched an armed robbery so badly that he was deemed to be more in need of therapy than punishment. He was committed to S,ter, Sweden's equivalent of Broadmoor, and began a course of psychotherapy and psychoactive drugs. During the therapy, he began to recover memories so vicious and traumatic that he had repressed them: sickening scenes of...