All Tilly Angelica wants for her thirteenth birthday is to be normal! But with her changeover party looming and her mad, magical family gathering from near and far, Tilly is set to inherit a terrifying or tantalising talent of her own. As the enchanted Angelicas gather and Arial Manor becomes a madhouse, Tilly's troubles are tripled by her creepy cousin Prosper and his sinister plot to bewitch the family by harnessing the powers of the Perigee Moon. Can Tilly Angelica and her magical menagerie cause enough commotion to outwit her creepy cousin and save the family manor?