Police Detective Akechi's Splendid Inference

Synopsis

Hajime is arrested by the police: he's been made a suspect in the murder of moneylender Tadao Eguma, killed on a night train. Kengo Akechi, the Metropolitan Police's elite superintendent, rises in his place to uncover the truth. Aside from Hajime, various people were riding that train. Could the true culprit be among them?