little later they were on the buckboard and bound for home.
When they arrived at the farm they found that their uncle had sent a long letter to the officers of the traction company, relating in full what had occurred. In return the officials of the concern said they would put a private detective on the case, and this was done. But weeks went by and nothing was seen or heard of Merrick and Pike, and what had become of the missing bonds remained a mystery.
"I am anxious to take a look at that cave where the stolen freight was stored," said Sam one day. "Supposing we drive to it?"
"That will suit me," answered Dick. "I want to learn about something else—that red tin box I saw hanging from a tree."
"Oh, yes, I had forgotten about that," put in Tom. "Well, shall we walk or drive over?"
It was decided to drive as far as the cave, and not knowing how long they would be gone, the boys took a lunch along.
"Now, take care of yourselves," warned Randolph Rover. "Don't fall into any more holes."
"We'll try to watch out!" sang out Tom. Then Dick cracked the whip, and off the team started at a good pace, the eldest Rover, however, holding them well under control. It was a clear and beautiful day. The boys did not dream of the odd adventure in store for them.
