Theresa Schurman is a young woman in 1781 Vienna who disguises herself as a man in order to play the violin in orchestras throughout the city, since women were not allowed to play in orchestras at that time. She uses the money to support her widowed mother and two siblings who have fallen on hard times after her father, a violinist, was murdered (in the first book in the series, The Musician's Daughter). One evening, while walking home from a concert, Theresa witnesses a murder, but doesn't see the killer's face. The victim whispers to her, with his dying breath, only one word: "Mozart."
With the help of her best friend Mirela, a Romany (Gypsy) woman, Theresa reports the murder to the police, but by the time the police and the dashing Captain von Bauer, who works with them, arrive at the scene, the body has disappeared. Theresa finds strange symbols carved into a tree at the spot where the murder took place, but no one is willing to tell her what the symbols mean. In fact, no one seems to believe her story except Mirela and Zoltán, the handsome young Hungarian nobleman Theresa met in The Musician's Daughter, and he tells her to leave the investigation to him.
In spite of this discouragement, Theresa is determined to find the killer. She discovers that the victim was a Jewish musician. At this time, Jews were not allowed to play in orchestras, except in concerts in Jewish homes, unless they converted to Catholicism. Theresa sympathizes with the Jewish musicians because she herself can only play in the orchestra when disguised as a man. As she proceeds with the investigation, she discovers a conspiracy, involving a secret lodge of Freemasons, that extends to the upper reaches of Viennese society, including Emperor Joseph II himself. Is someone trying to make sure that Mozart's new opera, The Abduction from the Seraglio, is never performed? Theresa finds herself in danger, and she doesn't know if she can trust anyone, even her friends.
The Mozart Conspiracy is a wonderful story, written for a young adult audience, even though adults will enjoy it as well. Dunlap brings the Vienna of Haydn and Mozart brilliantly to life. We also learn about antisemitism and discrimination against the Romany people, and about gender inequality in that society. Theresa is a strong character, highly intelligent and talented, but she makes mistakes, which make her seem all the more real. Relatively early in the book, she gets invited to the same party in both of her identities, and she makes the wrong choice, which ends up offending the family of her favorite student, a Jewish girl, and costing Theresa her position as their daughter's teacher. Her guilt over what happened is powerfully conveyed. Theresa is also very independent-minded, and devoted to music. She loves Zoltán, but she hesitates to marry him because she thinks it would mean giving up her music, except in the confines of the home.
I highly recommend The Mozart Conspiracy to all readers ages 12 and up. It is the second book in a series, but it easily stands on his own. It will make you want to read The Musician's Daughter, though, if you haven't already. I can't wait to read the upcoming sequel, The Paris Affair.