"There is absolutely nothing there, and no one can possibly have left the grounds," said Eltham amazedly.

We stood on the lawn looking at one another, Nayland Smith, angry but thoughtful, tugging at the lobe of his left ear, as was his habit in moments of perplexity.

CHAPTER IX

WITH the first coming of light, Eltham, Smith and I tested the electrical contrivances from every point. They were in perfect order. It became more and more incomprehensible how anyone could have entered and quitted Redmoat during the night. The barbed-wire fencing was intact, and bore no signs of having been tampered with.

Smith and I undertook an exhaustive examination of the shrubbery.

At the spot where we had found the dog, some five paces to the west of the copper beech, the grass and weeds were trampled and the surrounding laurels and rhododendrons bore evidence of a struggle, but no human footprint could be found.

"The ground is dry," said Smith. "We cannot expect much."

"In my opinion," I said, "someone tried to get at Caesar; his presence is dangerous. And in his rage he broke loose."

"I think so, too," agreed Smith. "But why did this person make for here? And how, having mastered the dog, get out of Redmoat? I am open to admit the possibility of someone's getting in during the day whilst the gates are open, and hiding until dusk. But how in the name of all that's wonderful does he GET OUT? He must possess the attributes of a bird."