The president of the Japanese National Railways is found dead during a period in which train service is plagued by numerous layoffs, strikes and shutdowns. The government says that the president was murdered; the police claim it was a suicide. A quizzical reporter follows the case for years, but the basic question remains unanswered: was the victim killed by members of the burgeoning Communist movement in Japan, or was the death stage-managed by the authorities in hopes of discrediting the Communists?
Kitagawa is an engineer charged with construction of a gigantic tunnel through the Japan Alps for the transportation of equipment in the building of the massive Kurobe Dam. The tunnel crosses an earthquake fault and Kitagawa is beleaguered not only by cave-ins and flooding, but by strife between management and the workers's union. Adding to Kitagawa's stress is the knowledge that as his attention is pulled inexorably toward the tunnel construction, his youngest daughter is dying from leukemia.
A rookie newspaper journalist, Takema Sakaki, has a strong sense of justice. In the Diet Building he gets acquainted with a library worker, Reiko Nakafuji. Reiko's father was a member of the Diet who was assassinated six years ago. Through Reiko, Takema joins Tsūkai-kai, a group of young people who respect her late father's political ideas. With the assistance of Tsukai-kai, Takema eventually uncovers the political scandal related to postwar compensation which led to the murder of Reiko's father.