Harleen Dahlia Potter-Black, 'Harley' or 'Lia' to her friends and family, the older twin sister to the 'Boy who lived' always saw herself involved in her brother's misfortunes, even the horcrux hunt. Now? She is the 'Accidental Mistress of Death' as she likes to call herself. And even worse? She was in America on vacation for the second time when the zombie apocalypse hit.