The Phantom of the Subway is an investigative mystery set within the labyrinthine tunnels of New Mouse City's subway system. The plot involves a mysterious figure, the "Phantom," who is causing strange disturbances and chaos in the subway, scaring commuters, and potentially threatening the city’s infrastructure. Geronimo Stilton, driven by his journalistic duty, must descend into the spooky, dark tunnels to uncover the Phantom's true identity and motive. The book combines suspense and mystery with the claustrophobic setting of the subway, forcing the nervous Geronimo to overcome his fear of dark, enclosed spaces to solve the case.
