Stacy Schiff's The Witches deals with a horror we assume we know, but don't: the moral panic that tore apart the towns of Massachusetts in the seventeenth century. Adolescent girls, denouncing their neighbours, began a fashion for denunciation; it resulted in nineteen hangings, in torture, in the fracture of families and communities, and in the spectacle of a seven-year-old kept in miniature manacles. Was it like The Crucible? No, it was worse. Arthur Miller used the Salem story as a metaphor for the McCarthy era's paranoia. But using the past as stand-in for the present often sells it short, and gives its complexities permission to elude us. Context is everything, and Schiff defines it; she interrogates her sources, makes every detail count, and her style is intriguing - sharp-eyed, discriminating, crisp. You want to understand the subject, and you want to meet the historian. Hilary Mantel TIMES LITERARY SUPPLEMENT