“See here, Casco, I want you to shut up. I have not been following you, and I am not in the habit of being addressed as you have addressed me. The quicker you get out of here the better.”

“Humph! So you fancy you can bluff me?” sneered the scar-faced man.

“It’s no bluff, I want you to take back what you said.”

“Take back nothing, Landes. You are a sneak—and worse, and——”

Casco did not finish. Drawing back, Frank left out with his right hand and Casco received a slap on the cheek that sent him staggering.

“The next time you address a gentleman be careful what you say.”

With a howl of pain and rage, Casco gathered himself together.

Bob looked on with keen interest. Frank seemed to be well able to take his own part, and so the youth saw no reason to interfere.

Muttering something under his breath, Casco now sprang to the edge of the piazza and looked around. No one appeared in sight. Bob was standing in a deep shadow, and in his rage the scar-faced man did not notice him.

Suddenly Casco put his hand into his pocket and drew forth a short club. It made Bob start.