Welcome to Quedlinburg – perhaps the most beautiful German town in the world! It’s the fairytale hometown of the world’s most famous Brass music competition.
Our young hero Elly (12) was not prepared for what happened next: whenever Elly is exposed to brass music, black veins spread on her body! What most people in town don’t know is the dark secret of Quedlinburg. Below the town is an underworld where nightmarish creatures sleep. And what keeps them in their constant state of dizzyness is… the brass music. But there have been incidents where creatures attacked people in town. That’s why “The ones who know” have decided that the time of the underworld should come to an end. They created the most powerful instrument - the glass trumpet. It will seal the fate of the creatures. Now they just need the right person to play it.
Elly discovers her own connection to the underworld. She teams up with her outcast friends to save it, not knowing that she has been tricked…