“An architect’s plan! Nothing but a plan!” exclaimed Jack.
“That’s all,” added Bert in disappointed tones.
“Maybe they didn’t drop it at all,” suggested Dick. “It may have been there all the while, and they didn’t bother to pick it up. I don’t see what good it is, though.”
Tom said nothing for a space. He was intently studying the sketch.
“Chuck it overboard,” spoke Dick.
“No, mail it back to Skeel, and tell him how we found it,” was Bert’s suggestion. “It’ll show him how close we are on his trail.”
“I’ll do neither,” answered Tom quietly. “We’re going to keep this piece of paper for ourselves.”
“Can you make head or tail of it?” asked Jack.
“I fancy I can,” answered our hero. “I think this is a detail drawing of the floor plans of the old mill, and I believe it may be the key to the location of the treasure—or at least the place where the treasure is supposed to be.”