In Pontikton, everyone is talking about it: the Opera is preparing to open the season with a grand performance. Among the audience will be the famous Sherlocko, the most eccentric and brilliant detective of Ponikonisos. By his side will obviously be Geronimo Stilton, ready to assist his detective friend in any way. Indeed, the air smells of mystery and a new case arises before the curtain even opens! The adventures of Sherlocko Cases that are impossible to solve? Don't worry! With the great Sherlocko and his assistant... that is, me, you are in good hands. Follow us in our investigations, from one clue to another until the mystery is solved. We will experience an adventure... Sherlockian. On the honor of Stilton, Geronimo Stilton. 1. ELEMENTARY, STILTON! Young Ginger disappears and her aristocratic parents are very worried. They assign the investigation to Sherlocko, the best detective of Ponikonisos, and his assistant, Geronimo. There are many suspects and the solution to the mystery is not easy at all!