When a little piglet accompanies her grandpa to the museum on copying day, she soon discovers that something is amiss.Large sections of the museum's paintings have been cut out and forgeries sewn in their place.Who would commit such a theft, and how could they have pulled it off? This little piglet is determined to find out. As she searches for clues, beginning detectives can try their hand at a little sleuthing too! Looking closely to discover all that's hidden among the delightful details in Arthur Geisert's illustrations, keen observers may just find the key evidence they need to solve the mystery of the museum's missing masterpieces.