Grandmorin's murder and the suppressed investigation
Deputy stationmaster Roubaud learns that his wife Séverine was sexually abused as a girl by her guardian, the railway-company director Président Grandmorin. He forces her to lure Grandmorin into a coupé on the Paris–Le Havre express, where the couple stab him to death. The examining magistrate Denizet eventually suspects Roubaud, but the Ministry of Justice's Camy-Lamotte pockets Séverine's incriminating letter and has the case shelved to spare the Imperial regime a scandal before the elections.
