ISOBEL Radiant, innocent, her perfect oval face crowned by a glory of red-gold curls, Isobel left the Inverness convent a devout servant of God. Then - ravaged a shocked by a brutal marriage - she learned a new kind of devotion - to evil! And a sensuous devotion to the mysterious Frenchman who brought her ecstasy. By day she was a model village wife. On moonlit nights - when the coven people called and her lover summoned - she rode in wild abandon to do demonic mischief. And even murder!