We just finished the Art Fraud Detective by Anna Nilsen. It is a superb book that helps kids look at painting in detail from The Museum of Art while solving a crime. It helps build problem solving skills while learning about famous artists and their paintings.
The premise of the book is that the museum had an informant call in and let them know that 30 of their paintings have been stolen and replaced with forgeries. There are four gangs. each with four forgers, that are behind the crime. Each gang leaves behind a symbol on their forgeries and each forger leaves behind a certain number of changes to each painting as their calling card. It is up to the reader to figure out who is behind each forgery, which paintings are real, and the identity of the mystery caller.
We would highly recommend this book! (Check your local library.)