A cold and melancholy walk of a couple of miles brought us to a high wooden gate, which opened into a gloomy avenue of chestnuts. The curved and shadowed drive led us to a low, dark house, pitch-black against a slate-colored sky. From the front window upon the left of the door there peeped a glimmer of a feeble light.

"There's a constable in possession," said Baynes. "I'll knock at the window." He stepped across the grass plot and tapped with his hand on the pane. Through the fogged glass I dimly saw a man spring up from a chair beside the fire, and heard a sharp cry from within the room. An instant later a white-faced, hard-breathing policeman had opened the door, the candle wavering in his trembling hand.

"What's the matter, Walters?" asked Baynes sharply.

The man mopped his forehead with his handkerchief and gave a long sigh of relief.

"I am glad you have come, sir. It has been a long evening, and l don't think my nerve is as good as it was."

"Your nerve, Walters? I should not have thought you had a nerve in your body."

"Well, sir, it's this lonely, silent house and the queer thing in the kitchen. Then when you tapped at the window I thought it had come again."

"That what had come again?"

"The devil, sir, for all I know. It was at the window."

"What was at the window, and when?"

"It was just about two hours ago. The light was just fading. I was sitting reading in the chair. I don't know what made me look up, but there was a face looking in at me through the lower pane. Lord, sir, what a face it was! I'll see it in my dreams."

"Tut, tut, Walters. This is not talk for a police-constable."