Geisert hits a new stride in this inventive, engaging mystery as a young piglet girl goes with her grandpa to the art museum for copying day—when the museum is closed and artists can come and paint or draw the collection. The piglet notices pieces of the paintings are missing and replaced with inferior patches. A ladder, apple core, and long coarse hair are clues that lead to a raccoon as the suspect, but the real culprit is somebody else. Geisert’s usual finely detailed etchings flourish, involving readers who will love playing detective along with the piglet. Myriad details in the illustrations and pig images in paintings, sculpture, and mobiles throughout the museum command repeated viewing. Clever and ingenious with a great title: wonderful entertainment. (Picture book. 5-9)