In an enclosure, you remember, was a key concerning the purpose of which nothing was said in the letter.

Well, in the course of the exploration of the caravan, which went on for some days, always yielding a fresh discovery, Robert came upon a box securely fastened to the floor in a dark corner.
"Mother! mother!" he cried; "where's that key?
I've found a mysterious keyhole!" They all hurried to the stable yard to see, and Robert swiftly inserted the key, and turned it.

He fell back, too much overcome to speak.

The box contained twenty-five new sovereigns..