“Look,” said Baisemeaux, going to the window. “It is that tower to the left—-the second one.”

“Is the prisoner at fifteen francs there?”

“Yes.”

“Since when?”

“Seven or eight years, nearly.”

“What do you mean by nearly? Do you not know the dates more precisely?”

“It was not in my time, M. d’Herblay.”

“But I should have thought that Louviere or Tremblay would have told you.”

“The secrets of the Bastile are never handed over with the keys of the governorship.”

“Indeed! Then the cause of his imprisonment is a mystery—a state secret.”