Naples, the 19th Century.

In the Kingdom of the Two Sicilies, holy music has power. Under the auspices of the Church, the Sung Mass can bring about actual miracles like healing the sick or raising the dead. But some believe that the musicodramma of grand opera can also work magic by channeling powerful emotions into something sublime. Now the Prince’s Men, a secret society, hope to stage their own black opera to the empower the Devil...