Witch Zilly is throwing a huge party - a magical gift for all birthday kids! Friday the thirteenth - Zilly, the crazy witch, is having her birthday! This calls for a big celebration, yes indeed. Zilly and her little black cat Zingaro get right to work: invitations are sent out, cleaning and cooking are done, and a festive dress is sewn. On Zilly's big day, all sorts of wizards and witches come buzzing in, but just when the party really gets going, suddenly all the guests disappear. Vanished! Without a trace! The book of special spells must be consulted - and a fantastic surprise awaits.