"Just step in here," said the boy, "and I'll call Mrs. Montgomery."

Mark took a seat on the sofa and awaited the arrival of the lady.

He did not have long to wait. The door opened, but the lady he expected did not appear. Instead, a young man entered whom Mark instantly recognized as the person who had left the Fifth Avenue stage under suspicious circumstances on the day when the old lady was robbed of her pocketbook.

Mark started and wondered if the recognition was mutual. It did not appear to be.

"You're the jeweler's boy, I believe?" said the newcomer languidly.

"I came from Henry Swan."

"Exactly, and you have brought two diamond rings with you?"

"Yes."

"All right! You can show them to me."

Mark's suspicions were aroused and he felt that he had need of all his shrewdness. He was very glad now that the diamonds were paste and the rings of little value.