The Second Mrs. Giaconda, by E.L. Konigsberg, is a historical novel featuring Leonardo da Vinci and the background of his famous painting, the Mona Lisa. The story is told from the perspective of Leonardo’s apprentice, Salai. Before meeting Leonardo, Salai was a liar and a thief. Leonardo catches Salai in the act of stealing, but does not punish him. Leonardo realizes that Salai and his family are living in poverty. Moved by compassion, Leonardo takes in Salai as an apprentice.

Soon after Salai is made an apprentice, it becomes apparent that Leonardo favors him over his other apprentices. A bond develops between the master and the apprentice that becomes stronger through the many hardships that they endure together. After a surprising turn of events, this relationship ultimately leads to the painting of the Mona Lisa.

This is a short novel, but I enjoyed it very much. Even though the story is fictional, it seems realistic. It gives a sense of what life was like during the Renaissance. I think that this book conveys the emotions of the characters very well. I was especially impressed by the development of the character of Leonardo da Vinci, but I enjoyed the other characters as well. 

Overall, I found this book to be very compelling. The plot twists are intriguing, and surprisingly complex for such a short book. The story also teaches good lessons, such as the dangers of wealth and materialism. This book is very entertaining, and I would recommend it to anyone.