Books with author William Pene du Bois

This is the fifth book published by the author. It was featured on one page of a Life magazine story about his family. A striped horse (NOT a zebra) is hired to solve a robbery at a circus. To investigate the crime, Geppy poses as a variety of circus entertainers, including a freak, a tightrope walker, and a lion tamer. In the end he discovers that there has not been any theft; rather, the culprit has been breaking into the company safe to contribute money to the financially struggling circus. For his success, Geppy is honored as a hero and is even appointed the circus's newest star: he gives an extraordinary performance when shot from a cannon.