Back from Egypt, the Emperor brings back to Paris a thousand treasures and wants to expose them in two days. At the museum, Edgar Plantin must quickly create a selection based only on looks. Exhausted, in the last object, he recognizes... a trumpet. When visiting, the Emperor wants to hear the instrument. What a commotion! We improvise a throne, a stage, decorations; we call artists. But Edgar understands his mistake: this trumpet isn't one. What enchanted show will come out of all this?