The Vivaldi Cipher takes place during the election of a new Pope in mid-18th century Venice. Famed violinist Antonio Vivaldi is a close friend of Cardinal Pietro Ottoboni who is expected to be elected as the next Pope. Before Ottoboni is killed during the conclave, Vivaldi learns about a ring of art forgers who are replacing the Vatican's priceless artworks with expertly painted fakes. Feeling desperate, Vivaldi hides a message in a special melody hoping that someone will take down the culprits. There is an alternate plot that takes place in the current era. When a dying mafia don gives his final confession, he informs the priest hearing the confession that there are many forged paintings in the Vatican Museum and that the key to their identities lies hidden in a piece of music. Father Dominic, prefect of the Secret Archives, investigates. He is mystified when he finds a cipher in an old composition from Vivaldi. Wanting to stop this centuries long conspiracy, he calls upon fellow sleuth Hana Sinclair and Dr. Livia Gallo, a music cryptologist, to help him crack the code and learn which paintings are fake. However, the Camorra, an Italian mafia clan, refuse to allow Father Dominic to interfere with their lucrative operation.

While this is an engaging story I could not help but think that the secret concerning the art thefts was divulged to too many people. By the time Hana and Dr. Gallo consult with other art experts as well as those providing security for them, 10 people know what the secret is. They, of course, tell more people and this deathbed secret is no longer much of a secret. Everyone in Venice who counts knows and so do several folks at the Vatican, putting them all in danger.

That said, the story was engrossing. I couldn't put the book down and spent an entire day reading it. As an art lover, the descriptions of the artist studios interested me. Of course, it should go without saying that the Venetian setting was delicious. Reading about the boats gliding through the Grand Canal reminded me of my own gondola rides in Venice several years ago. The mask shop described in the novel sounds like one I actually visited so the book sent me on a huge trip down memory lane.

It was quite creative for the author to hide clues to the art thefts in a musical score. The score needed a cipher so that someone could discover the clues. Esteemed musician Antonio Vivaldi created the cipher in the story as well as the score. The type of music was also another clue so there were many twists and turns in this mystery.

One of the characters, Dr. Gallo, is a music cryptologist which I had never heard of before. It is an actual profession though. The cipher is created by assigning a letter to each note in a score. A secret message can be found by decoding each word and then each sentence. Music cryptology has been written into the novels of other authors as well as in to a TV program. It is a new concept for me though. I found out from Wikipedia that it was popular in the 17th and 18th centuries.

While advertised as a historical mystery, approximately 60% of the story takes place in the current time period. I thought that it was a great book and both historical fiction and mystery fans will like it as well. 4 out of 5 stars. ( )