"But where is Dick?"
"That's what I'm coming to. They may have caught him but I hope not. I don't think they did, either. I think he'll come along here pretty soon. And, if he does, he'll have an awful surprise."
"I'll stay here and tell him–"
"You're a brick, Jack! It's just what I was going to ask you to 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 where they had been? Why should he think it would be hard for them to explain their actions?
"There isn't any answer," he said to himself. "And, if there was, I'm a juggins to be trying to find it now. I'd better keep my mind on this old machine, or it will ditch me! I know what I've got to do, anyhow, even if I don't know why."
Mile after mile he rode, getting the very best speed he could out of the machine. Somewhere ahead of him, he was sure, riding back toward London, was Graves. In this wild pursuit he was taking chances, of course. Graves might have turned off the road almost anywhere. But if he had done that, there was nothing to be done about it; that much was certain. He could only keep on with the pursuit, hoping that his quarry was following the straight road toward London. And, to be sure, there was every reason for him to hope just that.