"Well, I did think of going to Grant at the Yard and saying quite frankly that I had found out how she could have known about the Sharpes and about the house; and that she had met a man in Larborough and that I had a witness of the meeting."
"So that they could do what?"
"So that they could investigate the girl's movements during that month instead of us."
"And you think they would?"
"Of course. Why not?"
"Because it wouldn't be worth their while. All they would do when they found out that she was not trustworthy would be to drop the case thankfully into oblivion. She has not sworn to anything so they could not prosecute her for perjury."
"They could proceed against her for having misled them."
"Yes, but it wouldn't be worth their while. It won't be easy to unearth her movements for that month, we may be sure. And on top of all that unnecessary investigation they would have the job of preparing and presenting a case. It's highly unlikely that an overworked department, with serious cases flooding in at their doors, are going to all that bother when they could quietly drop the thing on the spot."
"But it's supposed to be a department of Justice. It leaves the Sharpes—"
"No, a department of the Law. Justice begins in court. As you very well know. Besides, Rob, you haven't brought them any proof of anything. You don't know that she ever went to Milford. And the fact that she picked up a man at the Midland, and had tea with him, doesn't do anything to disprove her story that she was picked up by the Sharpes. In fact the only leg you have to stand on is Alec Ramsden, 5 Spring Gardens, Fulham, South West."