"Did you take her to any address there?"

"No; just to the square. Then I waited to fill my pipe, and I saw the
woman, if woman it was, walk across the square and get into another cab."

"If you haven't anything else to do," hinted Jack, "suppose you take us
to Furnam Square now."

Within a very few minutes the three friends were gazing out of a cab
window upon the square. It looked like a very quiet residence section.

"There was another cab here, you say, that took your last 'fare' from
this square?" asked Jack.

"Yes; there is a fellow who has a regular stand here. It's his cab,"
replied Medway.

"Let us know, then, when that particular driver gets back here," begged
Jack. "We'll sit here in your rig and wait."

Medway grinned. Waiting, as well as driving, meant money for him.

Fully an hour and a half dragged by. Jack was beginning to wonder if
it would not be better to give up this present clue to the chase, when
Medway, leaning down from his box, called quietly.

"That's the other fellow and his rig, coming back into the square now."

"As soon as he stops," directed Benson, "drive us over alongside. Don't
say anything to him. Let me do the talking."