On the night before the premiere of Beethoven's Fidelio maestro Angelo, the orchestra director, recognizes a mysterious thief has stolen the musical scores. To retrieve them, Angelo must solve a series of music-themed riddles that have been scattered throughout the opera house.

On the night before the premiere of Beethoven's Fidelio maestro Angelo, the orchestra director, recognizes a mysterious thief has stolen the musical scores. To retrieve them, Angelo must solve a series of music-themed riddles that have been scattered throughout the opera house.