“What, then, is the answer to this riddle?”
“A new theory,” said the stranger. “We must gather every bit of information that may serve as a clew.
“There is a murderer in this. We must consider the subject from his standpoint.”
“You have a theory?” Lukens queried.
“More than a theory.” The calmness of the stranger’s voice chilled Lukens. “I have a solution!”
THE stranger folded his hands beneath his chin and rested his elbows on the arms of his chair. His darkened spectacles gave him an owl-like appearance.
“Some one,” said the man in black, “learned of the existence of the secret drawer in this desk. That person surmised that the drawer contained something— probably a document — of importance. He resolved to steal it.
“He entered this house, made his way into the room, and managed to open the drawer. He stole the article that he desired. That took place on the first night that Oscar suspected a burglar in the house.”
“There was a second burglar—” began Lukens.
“I know,” interrupted the stranger. “That became necessary.”