“Do you suppose——” he began.
Dick jumped.
“A marker for the mine! Good heavens! I never thought of that!”
“It might be,” said Sandy in an awed, breathless tone.
“Yes, it might.”
“It points over there at that perpendicular wall on the other side of the lake.”
“The mine couldn’t be under water,” protested Dick.
“No, of course not. But it could easily be off somewhere in that general direction.”
“Over on the other side of the cliff, you mean?”
“Yes.”