“Yes, it was Martell, and Nappy was with him.”

“Well, there is nothing strange about that,” came from Andy. “Probably he wants to see his father now he is in New York again.”

“I’d like to know what Nappy has told his father about us,” went on Fred. “You can wager it’s nothing good.”

“I don’t care what he says, so long as he leaves us alone,” said Jack.

Another elevator appeared, and the four boys descended to the ground floor of the office building. Here half a dozen people were waiting to go up, while several others were at the rear of the corridor, talking earnestly.

“Hello! there are Slugger Brown and his father,” exclaimed Fred, pointing down the corridor. “Now, what do you know about that!”

“They must be in this building to visit the Martells,” returned Jack.

“They are talking to two men,” put in Randy. “I wonder who they can be?”

“Oh, some friends or business acquaintances, I suppose,” answered the oldest of the Rover boys.

Ordinarily none of the Rover boys considered eavesdropping honorable, but they thought it a different thing when dealing with their enemies, and Andy, being naturally inquisitive anyway, sauntered down the corridor and passed the group that was talking so earnestly. The backs of both Mr. Brown and Slugger were toward him, so neither noticed the lad.