Early one June morning, locomotive No.783 screams to a halt. A man's body lies next to the railway tracks, shot in the back. The dead man was a factory owner with many enemies, but they all seem to have unbreakable alibis. And for every delay in the investigation, there is a further price to pay in blood. Desperate for help, the police call on the indefatigable Inspector Onitsura. Crisscrossing the country by train, he begins to unravel the threads of a dark deception -- but it will take a stroke of brilliance to bring the cunning culprit to justice.