"Ah!" And each of the two men looked at his companion significantly.
"Do you know Mr. Dart?" asked the sick man.
"We know of him."
"He does quite a business, doesn't he?"
"He does—in his own way," was the suggestive answer.
At that moment came a tramping on the stairs. Then the office door was thrown open, and Hamilton Dart appeared.
"There he is!" cried one of the men. "Just as I thought!"
He started for the doorway, but Hamilton Dart was too quick for him. He backed away, leaped for the stairs, and went down flight after flight, four and five steps at a time. Both men gave chase, but by the time they reached the sidewalk the swindler had disappeared.
"Hullo! what can this mean?" cried Nat, in quick alarm. "I must say I don't like this."
"Those men are after Mr. Dart," came from Harry Bray.