On the day following the conversation recorded above, they were surprised to receive a visit from Regnier himself—an alert, dark-eyed man who seemed seriously perturbed.

“There is no time to be lost,” he declared. “I hear to-day from Gaston that he has managed to get a near view of the new German machine. He says it rose apparently from the flat roof of a house standing in its own grounds outside Spandau. He happened to be near and caught sight of it just in time. Of course it was dark and he could see no details. But he is positive that the machine rose nearly straight up from the flat roof at an angle far too steep for any of our machines. That alone is sufficient to show that the Germans have got hold of something new and valuable. He waited for a long time, and finally saw the machine return. He declares it landed again on the roof. Evidently, Monsieur Manton, they have found out something along the lines of your invention, even if they have not actually got your secret.”

“How far away was Gaston when he saw it?” asked Dick.

“It must have been at least a quarter of a mile,” replied Regnier, “as the grounds are very extensive. Gaston dared not venture an attempt to get inside; the high fence is utterly unscalable, and the two lodge gates are always kept locked and there is a keeper at each.”

“And he heard the engine?”

“Yes, he says so specifically,” replied the Chief.

“Well,” said Dick, “at any rate we are ahead of them to that extent. If it had been my machine he would not have heard the engine at all at that distance.”

“However,” he went on, “it is evidently time we acted. Now, Monsieur Regnier, Mademoiselle Pasquet has told me what you want. I am willing to go. But I shall have to take the Mohawk. How are we to hide it? I can get over and back at night safely enough, but to hide the machine in the day-time will be another matter.”

“Gaston can arrange that,” the Chief declared. “You know he has a farm a short distance outside, Spandau. There is a big barn there with no sides, and your machine can be easily dragged into it and concealed during the day. You know Gaston is passing as a German farmer. He has acted for years for us in this way and has never even been suspected. But you could not stay long.”

“Very good,” said Dick. “I think the best plan will be for Jules to go by motor and for Mademoiselle to go separately by train. They must find out somehow exactly where the German plane is lodged and, if possible, where the plans are likely to be kept, and I must act accordingly. In any case, there will be no difficulty in smashing up the machine, but unless we destroy the plans as well they will be building another too soon to suit us. I will go to Verdun and wait there with the Mohawk until the time comes for me to fly over.”