A long, long time ago, or perhaps not so long ago... Beyond the mountains, beyond the forests, or perhaps somewhere nearby... Bolko, the son of the trumpeter in the town hall tower, rescues a wounded raven. It turns out to be the Raven King himself. In gratitude, the King gives the boy a magic trumpet. Thanks to Spy 006, news reaches the rulers of neighboring countries of a gold-making machine, supposedly invented by Mercurius Practicus, a famous Poznań scientist and inventor. They decide to force the city's mayor to hand over the machine. Enemy armies surround the city. When the defenders lose hope of survival, Bolko calls upon the Raven King for help.