"Good-night, Dick!"

Morning saw them up on time, and off to Ealing. There Colonel
Throckmorton gave them their orders.

"I've requisitioned motorcycles for you," he said. "Make sure of the location of the house, so that you can mark it on an ordnance map for me. Then use your own judgment, but find the next house. I have had letters prepared for you that will introduce you to either the mayor or the military commander in any town you reach and you will get quarters for the night, if you need them. Where do you think your search will lead you, Fleming?"

He eyed Harry sharply as he asked the question. "Somewhere on the East coast, I think, sir," replied Harry.

"Well, that remains to be seen. Report by telegraph, using this code. It's a simplified version of the official code, but it contains all you will need to use. That is all."

Finding the house, when they started on their motorcycles, did not prove as difficult a task as Harry had feared it might. They both remembered a number of places they had marked from the cab windows, and it was not long before they were sure they were drawing near.

"I remember that hill," said Harry. "By Jove—yes, there it is! On top of that hill, do you see? We won't go much nearer. I don't want them to see us, by any chance. All we need is to notice which way they're signalling."

They watched the house for some time before there was any sign of life. And then it was only the flashes that they saw. Since the previous day some sort of cover had been provided for the man who did the signalling.

"What do you make of it, Dick?" asked Harry eagerly, after the flashing had continued for some moments.

"It looks to me as if they were flashing toward the north and a little toward the west," said Dick, puzzled.