o get a motor car, too.
I'm in a lot of trouble, Jack--it's Graves."

"Come on down. We'll walk out along the road toward London and meet you.
We've got a lot to tell you, but I'm afraid to talk about it over the
telephone."

"All right! I'll keep my eyes open for you."

Getting a motor car was not easy. A great many had been taken by the
government. But Harry remembered that one was owned by a business friend of
his father's, an American, and this, with some difficulty, he managed to
borrow. He was known as a careful driver. He had learned to drive his
father's car at home, and Mr. Armstrong knew it. And so, when Harry
explained that it was a matter of the greatest urgency, he got it--since he
had established a reputation for honor that made Mr. Armstrong understand
that when Harry said a thing was urgent, urgent it must be.

Getting out of London was easy. If a search was being made for him--and he
had no doubt that that was true--he found no evidence of it. His change of
clothes was probably what saved him, for it altered his appearance greatly.
So he came near to Bray, and finally met his two friends.

CHAPTER XVI

THE CIPHER

"What happened to you?" asked Jack and Dick in chorus.

Swiftly Harry explained. He told of his arrest as a spy and of his escape.
And when he mentioned the part that Ernest Graves had played in the affair,
Jack and Dick looked at one another.

"We were afraid of something like that," said Jack. "Harry, we've found out
a lot of things, and we don't know what they mean! We're sure something
dreadful is going to happen to-night. And we're sure, too, that Bray Park
is going to be the centre of the trouble."

"Tell me what you know," said Harry, crisply. "Then we'll put two and two
together. I say, Jack, we don't want to be seen, you know. Isn't there some
side road that doesn't lead anywhere, where I can run in with the car while
we talk?"

"Yes. There's a place about a quarter of a mile further on that will do
splendidly," he replied.

"All right. Lead the way! Tell me when we come to it. I've just thought of
something else I ought never to have forgotten. At least, I thought of it
when I took the things out of my pockets while I was changing my clothes."

They soon came to the turning Jack had thought of, and a run of a few
hundred yards took them entirely out of sight of the main road, and to a
place where they were able to feel fairly sure of not being molested.

Then