Yes, it is the new book by Pamela Cramer: Murder at the Frankfurt Opera.
The reader learn all about what's going on behind the curtain.
How singers sing, or not.
How voices develop, and are classified.
How one gets a job in Germany.
How unions order what and when things happen.
How one eats, sleeps and shops over the big pond.
How costumes and made, conductor conduct and sets work.
It is a veritable "How to book" about opera.
With details, that may surprise event the most fervent opera fan.
How mishaps happen.
And how a seeming mishap turns to murder.
More I shall not disclose-go ahead and read it!