When an enemy makes overtures of friendship, is anyone safe? An unexpected invitation from wily King Frederick causes composer Joseph Haydn to fear he's walking into a trap. After all, the Prussian King has never had any use for Haydn's music. His Majesty seems more intrigued at Haydn's being the son of a market-judge. Worse still, the invitation appears to stir up suspicion in the highest quarters in Vienna. So much...