The year is 1779, and Carlo Morelli, the most renowned castrato singer in Europe, has been invited as an honored guest to Eszterhaza Palace. With Carlo in Prince Nikolaus Esterhazy's carriage, ride a Prussian spy and one of the most notorious alchemists in the Habsburg Empire. Already at Eszterhaza is Charlotte von Steinbeck, the very proper sister of Prince Nikolaus's mistress. Charlotte has retreated to the countryside to mourn her husband's death...