“It’s another pirates’ nest, I’ll bet a hat,” said Jack.
Harry was about to answer, when he suddenly fell forward and measured his length upon the floor.
“What in the world is the matter with you?” cried Jack. “Are you hurt?”
“Not a bit,” said Harry, picking himself up. “I stubbed my toe against something. Ah, I see—it was this ring.”
The ring in question was about as big round as a saucer. It was attached to a thick staple, imbedded in the big square stones which formed the floor.
Jack got hold of the ring and pulled with all his might.
“Do you think it is a trap-door?” questioned Harry.
“I’m sure of it; but I can’t budge it, just the same. Lay hold here and help me pull it up.”
Harry took hold and they tugged away together.
Up came the stone, proving itself to be a trap door sure enough.