"If the Chief of the Radio Service wanted the wireless patrol," said Roy, "why did you telegraph for just the four of us? And why are we in New York instead of Washington?"
"You couldn't be of any use in Washington," said Captain Hardy, "but you may be of a great deal of service here. You see New York is a difficult place to guard. This is our principal port. It is so vast that it is next to impossible to watch all of it, and there are hundreds of thousands of Germans or people of German descent living here. The Radio Chief needs sharp eyes and ears as well as trained fingers just now, and he knows that you boys combine these qualifications. He suggested that I send for four of you and see what you could accomplish. I chose you four because you have shown the greatest ability along the lines necessary."
A flush of pleasure glowed in each of the faces before him. For a moment Willie Brown forgot where he was, forgot the crowd and the great station and the strange sights and sounds about him, forgot even why he was in New York, while his mind went back to that first summer at Camp Brady, when he had been the most backward, self-distrustful, helpless lad in camp. Now he was chosen to serve his government, to do work of the greatest importance for his country; and he had been selected because of his ability. No wonder Willie blessed the day he first saw Camp Brady. No wonder his eyes were wet with a grateful mist as he looked affectionately at his captain, who had made him what he was.
But Willie had little time for revery. Roy was speaking again, asking another of those sharp questions that showed very well why he should have been chosen as a spy hunter, or for anything else that required keenness of mind.
"What about yourself?" Roy was saying. "Do you have to go back to your medical duties? We can work ever so much better with you to lead us than we could with a stranger."
Roy alone had grasped the possibility that Captain Hardy might not be able to remain with them. Now every eye was fixed anxiously on Captain Hardy's face.
"No," he said, "I do not have to return to Washington. It is of the utmost importance to catch these spies and the government could well afford to give up one ordinary doctor in order to get four skilled spy hunters." He paused and smiled, then added: "So I have been detailed to special duty in New York."
The boys could hardly repress a shout of joy.
"And my instructions," continued Captain Hardy, "were to get into touch with the police and the secret service immediately. As I have told you, we must get acquainted with both. But before we do, I suggest that we take a look at the town where we are to work in the days to come. Let's be moving."
They rose and passed through the station. Its great vaulted ceiling, half as high as a church steeple, its huge flights of steps, its enormous corridors, its wonderful stonework, dwarfing into insignificance anything they had ever seen before, fairly awed the boys from Central City. It was Roy's keen eye that caught sight of the great maps of the world high up on the walls. The crowds of people coming and going hardly seemed like crowds, so vast was the structure. With reluctant feet the four boys pushed on. But when they had mounted the steps to the arcade and caught sight of the illuminated transparencies showing scenes along the railway's path, they came to a dead stop. For Willie Brown, with his almost uncanny eye for landscapes, at once declared that a certain picture represented a mountain scene not twenty-five miles from Central City; and when the others appealed to Captain Hardy, the latter confirmed Willie's statement.