“He must have noticed that closet door. He was a shrewd man, was Silas Harshaw.”
“We’ve linked him there,” agreed Cardona. “We’ve already tied him up with Throckmorton. Do you think he fixed the hose on the gas lamp?”
“In all probability,” said Biscayne. “Of course, a man was discovered in Throckmorton’s home. There are details that are still bewildering.
“The attempt upon my cousin Arthur’s life tonight, however, settles the case against Silas Harshaw.
“That bomb is crudely fashioned. Perhaps it was made in the old man’s workshop, right here.”
“We’ll look!” cried Cardona.
“Not yet,” said Biscayne. “We have work to do first. Perhaps there is more to find.”
“The old man’s model?”
“Yes.”
Cardona looked around the room. He spied the closed radiator. He turned quickly to Biscayne.