There were three clicks in rapid succession, and on the instant one of the brass plates of the box flew back, revealing a tiny compartment behind it, not over a quarter of an inch in depth.
"No diamonds there," said Tom, his face falling.

"Full of emptiness." "No, here is a sheet of parchment," returned Dick, pulling it forth.

"A map!" he added, as he unfolded it.

"Well, I never!" "Never what ?" came from Tom and Sam.
"Unless I am mistaken, this is like the map that was on that table in the cave, only this is much smaller." "That's interesting, too," said Tom.
"The back of the map is full of writing," said Sam.

He looked closer.
"It's in French." "This box must have belonged to one of those French-Canadian smugglers," said Dick.