do. I can't leave word for him any other way, and I don't know
what he'd think if he came here and found the cycles and all gone.
Then take him home with you, will you? And I'll ring you up just
as soon as I can. Good-bye!"

And everything being settled as far as he could foresee it then,
Harry went scooting off into the night on his machine. As he
rode, with the wind whipping into his face and eyes, and the
incessant roar of the engine in his ears, he knew he was starting
what was likely to prove a wild-goose chase. Even if he caught
Graves, he didn't know what he could do, except that he meant to
get back the papers.

More and more, as he rode on, the mystery of Graves' behavior
puzzled him, worried him. He knew that Graves had been sore and
angry when he had not been chosen for the special duty detail.
But that did not seem a sufficient reason for him to have acted as
he had. He remembered, too, the one glimpse of Graves they had
caught before, in a place where he did not seem to belong.

And then, making the mystery still deeper, and defying
explanation, as it seemed to him, was the question of how Graves
had known, first of all, where they were, and of how he had
reached the place.

He had no motorcycle of his own or he would not have ridden away
on Dick's machine. He could not have come by train. Harry's head
swam with the problem that presented itself. And then, to make it
worse, there was that remark Graves had made. He had said Harry
would find it hard to explain where he had been. How did he know