The detective saw that he was uneasy. He wondered whom Darwin had come to see.
Darwin, after a time, came back to the tenement, and entered again.
Carter did not move from his hiding place.
His quarry only remained inside a minute or so, and then came out, going back to the corner and halting.
Carter came out of the doorway. He strolled up to the corner, and stopped within a few feet of Darwin, who saw and eyed him.
Two or three times the man made a movement as if he were going to address Carter.
But he hesitated.
The detective made no attempt to speak. He looked up and down the street, and appeared unconcerned.
Carter wanted to see if Darwin would speak to him. He judged that if he waited long enough the man would do so.
Darwin crossed the street, halted a moment, and then came back. He glanced sharply, suspiciously, at Carter.