All that time Nick was looking out of the window, watching closely everything that was occurring on the opposite side of the street where he had discovered the spy standing, and watching him.
For the reader knows that Nick Carter went everywhere, prepared for all things that might happen.
The letter he had received from the President, while it had explained nothing, had nevertheless informed the detective at once what he was called to Washington for; and he had gone there prepared to take up the case in his own way.
And just at that moment, when he seemed to become somewhat abstracted, and did not pay the strict attention to the senator that he had been doing, it was because he saw one of his assistants come around the corner near the drug store and slowly approach the spot where the spy was standing.
It was Patsy, and Patsy was ready to obey any signal that his chief might choose to convey to him- for Patsy was one of three who had accompanied Nick Carter to Washington that day, coming, however, secretly, so that no one save themselves might understand that Nick had brought any one with him.
And now when Patsy appeared around the corner and approached the spot where the spy was standing, the detective leaned back in his chair and raised his arms three times over his head.
It was his signal to Patsy.
CHAPTER IV.
NICK CARTER'S PERFECT PLANS.
"One would suppose that you were signaling, to the spy," said the senator, watching him.