A businessman wants to build a drinks factory on the site of a source, which is considered sacred. All he needs is municipal funding. The contract is already signed and will remain valid as long as the work begins by a set deadline. The sensitive Sofia hears the voice of the source and gets her entire class on her side to prevent its destruction. Will they be successful? They only have 40 minutes, and the diggers are at the ready.

The Source is a school opera, in which the story progresses in real-time. The strikingly exciting tale poses some very current questions. Will we preserve the planet for future generations, or will we cause irreversible harm?