"No apology is needed, mon ami," Paul exclaimed quickly, well aware that the detective was merely obeying instructions. "I understand your position perfectly." Then, glancing round at his companions, he added: "You may sleep in peace, messieurs. I give you my word of honour that I will not attempt to escape. Why, indeed, should I? I have committed no wrong!"

One of the men had pulled out a well-worn notebook and was with difficulty writing down the prisoner's words—to be put in evidence against him. Le Pontois realised that; therefore his mouth closed with a snap, and, leaning back in the centre of the carriage, he closed his eyes, not to sleep, but to think.

Before leaving Verdun he had seen Pierrepont enter the telegraph bureau—to dispatch a message to the Sûreté, without a doubt. They already knew in Paris that he was under arrest, but at his home they were, happily, still in ignorance. Poor Blanche was asleep, no doubt, by that time, he thought, calm in the belief that he had been delayed and would be home in the early hours.

The fact that he was actually under arrest he regarded with more humour than seriousness, feeling that in the morning explanations would be made and the blunder rectified.

No more honourable or upright man was there in France than Paul Le Pontois, and this order from the Sûreté had held him utterly speechless and astounded. So he sat there hour after hour as the rapide roared westward, until it halted at the great echoing station of Châlons, where all four entered the buffet and hastily swallowed their café-au-lait.

Afterwards they resumed their seats, and the train, with its two long, dusty wagons-lit, moved onward again, with Paris for its goal.

The prisoner said little. He sat calmly reflecting, wondering and wondering what possible charge could be made against him. He had enemies, as every man had, he knew, but he was not aware of anyone who could make an allegation of a character sufficiently grave to warrant his arrest.

Why had it been forbidden that he should wish Blanche farewell? There was some reason for that! He inquired of Pierrepont, who had treated him with such consideration and even respect, but the agent of secret police only replied that in making an arrest of that character they made it a rule never to allow a prisoner to communicate with his family.

"There are several reasons for it," he explained. "One is that very often the prisoner will make a statement to his wife which he will afterwards greatly regret. Again, prisoners have been known to whisper to their wives secret instructions, to order the destruction of papers before we can make a domiciliary visit, or——"

"But you surely will not make a domiciliary visit to my house?" cried Paul, interrupting.