"Froo a trap-doo' in one corner, covered wid earf."
"And that's where Mason is keeping his prisoner, eh?"
"Yassah. We free lib dar."
"Is that where you carried Dalton on the night you took him from the cars?" demanded Old King Brady.
"Ob co'se," replied the coon. "An' if Mason find out dat I done tell yo' about it, 'spect he'd kill me like a dog."
"No doubt he would," said the old detective. "He is capable of doing almost any kind of villainy. Where were you to-night?"
"Bringin' food fo' de cave, as our supply ran out."
"I thought as much."
Just then Harry muttered:
"Well, the great swamp mystery turns out to be a very simple matter, now that we fully understand it, Old King Brady."