A nice book about art for children, a mixture between fiction and non-fiction. Well, there's more fiction but it teaches a little about paintings and connections etc. Also, it contains a type of a treasure hunt for the children to follow, a code to decipher, lots of fun things to do.
From the back cover: "A stolen painting. A series of unexpected events. Two smart children. Petra and Calder live in a neighbourhood where strange things have started to happen. Seemingly unrelated events connect, a sharp old woman seeks their company - and a priceless Vermeer painting disappears. Before they know it, the two children are caught up in an international art sensation where no one is above suspicion. As puzzling clues draw Petra and Calder deeper into the mystery, they mustely on their intelligence, their powers of deduction, and a newly acquired knowledge of the artist Vermeer, to crack an art crim that has left everyone baffled."