"If he had left the safe open, it would have been supposed mere robbery was the purpose. If he had left the lamp burning, and the library and outer doors open, there would have been nothing to show that some one had visited the room after the murder."
"There was the missing letter," suggested McManus, who seemed to be thinking with Trafford's thoughts.
"Yes," replied Trafford; "that was mistake number five."
"But, of course," went on McManus, "he had no means of knowing what was in it. If it had been still unsealed, it would have been different. As it was, he could not risk it; there was nothing else for him to do."
"Exactly," replied Trafford; "still, I think we can count it a mistake. The package of papers was what he really wanted. He should have been content with that."
"But how did he know that he had got all in that single package? Would he not be likely to examine the safe, especially the cupboard?"
