“It is very difficult for the police to do anything without evidence,” said Mr. Ludgrove gravely. “Now, since you have come to ask my advice, I am going to take an old man’s liberty and ask you both a question which you may consider impertinent. Have either of you any knowledge, concerning your dead parents, which you have not imparted to the police? Or, perhaps, I should have put it another way. Have either of you any suspicions, which you have thought it better to keep to yourselves, as to the motive which anyone might have had for committing these murders?”