On she advanced unhesitatingly, though into a short gloomy passage, and then Jack turned on the search-light.
The dazzling glare gushed into an enormous cavern in which, the James Boys had ridden upon their horses.
At the sides there were ledges and galleries, above the roof was domed, and from the main cave numerous passages branched off in various directions.
Near one of these passages stood Siroc with Jesse James astride of his back, the bandit clutching a rifle.
The rest of the men were grouped behind him.
"Hulloa!" he shouted at Jack.
"Jesse James, I demand your surrender!" cried the inventor.
"Why should I?" demanded the bandit.
"Because you can't get away from here alive."
"That's all you know about it. There are plenty exits."