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, indeed. Zilly and her little black cat Zingaro get started right away: invitations are sent out, cleaning and cooking take place, 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 is in full swing, suddenly all the guests disappear. Vanished! Without a trace! It's time to consult the book of special spells - and a fantastic surprise awaits.