While visiting a filmmaker friend on the set of a new movie with Thea, Benjamin, and Pandora, reporter Geronimo Stilton investigates mysterious accidents that are plaguing production and causing the film to go off course.

"Geronimo Stilton is granted a special interview with the great Sourishi, who lives in isolation and rarely gives interviews. To reach him, Geronimo and company must take the Rodent-Express, a steam engine that zigs and zags across perilous terrain and steep mountains. But, during the journey, Bugsy Wugsy mysteriously disappears! Can Geronimo crack the case before the end of the line?"--Provided by publisher