T. B. looked thoughtful.

"I had a dim idea that I might possibly discover in the occupant one who was, at any rate, a close relative to Fallock."

"You are doomed to disappointment," smiled the chief; "there is no doubt about that. I have had all the papers up. The man was certified insane by two eminent specialists, and is under the care of a doctor who lives on the premises, and who also acts as secretary to this Mr. Moole. The secret of the Secret House is pretty clear; it is a private lunatic asylum,—that, and nothing else."

T. B. thought for a while.

"At any rate no harm can be done by interviewing this cloistered Mr. Moole, or by inspecting the house," he said.

He arrived in Great Bradley in the early part of the afternoon, and drove straight away to the Secret House. The flyman put him down at some distance from the big entrance gate, and he made a careful and cautious reconnaissance of the vicinity. The house was a notable one. It made no pretence at architectural beauty, standing back from the road, and in the very centre of a fairly uncultivated patch of ground. All that afternoon he measured and observed the peculiarities of the approach, the lie of the ground, the entrances, and the exits, and had obtained too a cautious and careful observation of the great electrical power house, which stood in a clump of trees about a hundred yards from the house itself.

The next morning he paid a more open visit. This time his fly put him down at the gateway of the house, and he moved slowly up the gravel pathway to the big front entrance door. He glanced at the tip of the power house chimney which showed over the trees, and shook his head in some doubt. He had furtively inspected the enormous plant which the eccentric owner of the Secret House had found it necessary to lay down.

"Big enough to run an electric railway," was his mental comment. He had seen, too, the one-eyed engineer, a saturnine man with a disfiguring scar down one side of his face, and a trick of showing his teeth on one side of his mouth when he smiled.

T. B. would have pursued his investigations further, but suddenly he had felt something click under his feet, as he stood peering in at the window, and instantly a gong had clanged, and a shutter dropped noiselessly behind the window, cutting off all further view.

T. B. had retired hastily and had cleared the gates just before they swung to, obviously operated by somebody in the power house.