"It is something more than compliments you want from me, monsieur. Well, what can I do?"

"The second sleeping-car, compartments numbers 11 and 12," said Hillyard urgently. "In the water-tank of the lavatory there is a little metal case with letters from Berlin for Barcelona and Madrid. But wait, monsieur!"

M. de Cassaud was already at the door.

"It is the attendant of the sleeping-car who hides them there. If he can be called into an office quietly on some matter of routine and held there whilst your search is made, then those in Madrid and Barcelona to whom these letters are addressed may never know they have been sent at all!"

M. de Cassaud nodded and went out. Hillyard waited nervously in the little whitewashed room. It was impossible that the attendant should have taken fright and bolted. Even if he bolted, it would be impossible that he should escape across the frontier. It was impossible that he should recover the metal case from the water-tank, while the carriage stood openly at the platform of Cerbère station. He would be certain to wait until it was shunted into the cleaning shed. But so many certainties had been disproved, so many possibilities had come to pass during the last two years, that Hillyard was sceptical to his finger-tips. M. de Cassaud was a long time away. Yes, certainly M. de Cassaud was a very long——and the door opened, and M. de Cassaud appeared.

"He is giving an account of his blankets and his towels. There are two soldiers at the door. He is safe. Come!" said the Commissaire.

They crossed the platform to the carriage, whilst Hillyard described the attendant's anxiety that he should bolt his door. "No doubt he gave the same advice to the manufacturer of Perpignan," Hillyard added.

It was M. de Cassaud who arranged and mounted the steps in the tiny washing-room.

"Look, monsieur," said Hillyard, and he pointed to the little aperture in the coloured glass of the window. "One can see from the corridor what is going on in this room. That is useful. If a traveller complains—bah, it is the war!" and Hillyard laughed.

M. de Cassaud looked at the window.