"What do you think, from your standpoint, of the two affairs?" I asked, more for the delectation of Miss Raven than for my own satisfaction—I knew she was curious about the double mystery. "Have you formed any conclusion?"

"I've thought a great deal about it," he replied. "It seems to me that the two brothers, Salter and Noah Quick, were men who had what's commonly called a past, and that there was some strange secret in it—probably one of money. I think that in their last days they were tracked, shadowed, whatever you like to call it, by some old associates of theirs, who murdered them in the expectation of getting hold of something—papers, or what not. And what I would like to know is—why did Salter Quick come down here, to this particular bit of the North Country?"

"He said—to look for the graves of his ancestors on the mother's side, the Netherfields," I answered.

"Aye, well!" remarked the inspector, almost triumphantly. "I know he did—but I've had the most careful inquires made. There isn't such a name in any churchyard of these parts. There isn't such a name in any parish register between Alnmouth Bay and Fenham Flats—and that's a pretty good stretch of country! I set to work on those investigations as soon as you told me about your first meeting with Salter Quick, and every beneficed clergyman and parish clerk in the district—and further afield—has been at work. The name of Netherfield is absolutely unknown—in the past or present."

"And yet," suddenly broke in Miss Raven, "it was not Salter Quick alone who was seeking the graves of the Netherfields! There was another man."

The inspector gave her an appreciative look.

"The most mysterious feature of the whole case!" he exclaimed. "You're right, Miss Raven! There was another man—asking for the same information. Who was he! Where is he? If only I could clap a hand on him——"

"You think you'd be clapping a hand on Salter Quick's murderer?" I said sharply.

To my surprise he gave me an equally sharp look and shook his head.

"I'm not at all sure of that, Mr. Middlebrook," he answered quietly. "Not at all sure! But I think I could get some information out of him that I should be very glad to secure."