"Nacherly," agreed Cassidy, "if the old man is there. We'll take him, busted ankle an' all, into the Grampus an' snatch him back to Philadelphy, or wherever else he wants to go."
"Before we do that," said Matt, "why can't we finish up this work for him?"
"I don't savvy what you mean," said Cassidy. "Ain't the work about all finished? You've got the boat back for him, an'——"
"But why not find Turtle Key, look into that cave and then go back able to report to him that there's no iron chest on the island."
The eyes of all three of the men grew wide as they surveyed Matt.
"Great sandpipers!" exclaimed Cassidy, "didn't you hear about that? I supposed you knowed."
"Supposed I knew what?" demanded Matt.
"Why, about that iron chest."
"What about it?"
"You come with me, son," and Cassidy reached for Matt's arm and led him out of the periscope room and into the corridor.