In the mysterious city of Ponticton, where the rain falls incessantly, there is a mysterious investigation office on Conspiracy Street 13! There, the great and eccentric Serloco chooses the most interesting cases, which he investigates together with his trusted assistant, detective Geronimo Stilton. Among suspicions, bright ideas, clues, and wrong suspects, there is no case that remains unsolved... because Serloco is no fool! The adventures of Serloco Cases that are impossible to solve? Don't worry! With the great Serloco and his assistant... that is, me, you're in good hands. Follow us in our investigations, from one clue to another until the mystery is solved. We will live an adventure... Serloco-style. On the word of honor of Stilton, Geronimo Stilton. 1. ELEMENTARY, STILTON! Young Ginger disappears and her aristocratic parents are very worried. They assign the investigation to Serloco, the best detective of Mouse Island, and his assistant, Geronimo. The suspects are many and the solution to the mystery is not easy at all!