"One thing I can't understand though," Frank went on, "is how he appears sane at times, and again is like a violent maniac and does not know me. I am afraid of this. I am sure my father's mind is sound and good, and the only way I can account for it is that they must do something to him at times, to make him violent. It is to their interest to make him altogether insane, so they can control the property."
"How do you account for those men I heard talking in the building the time I was captured by the Upside Down Club?" asked Ned.
"I don't know who they were," Frank admitted, "but I am sure they were in the plot. They were probably planning some details or they may have been in Darewell to see my uncle. I believe he's in the plot."
"There's where I don't agree with you," said Bart. "Mr. Dent may seem to be playing into the hands of the men, but I think you will find he has been fooled by them. In fact, they admitted as much, according to what Ned overheard."
"I hope so, but I will not trust him until I have my father safe," Frank went on.
He then related how Mr. Roscoe had told of his detention in the asylum, his despair at never seeing his son again, of how he had heard of his wife's death, and of his desire to escape.
"And what are you going to do now?" asked Bart, when Frank had finished.
"I am going to rescue my father!"
"Then count us in!" exclaimed Ned.