I tried the shutters. Both were tight-fastened. More as an automatic gesture than with any hope, I moved along and tried the knob of the door. But the door was unlocked.

Though I tried to ease it open gently, the thing creaked and cracked at every foot. Ahead was the main hall of the small house, with the front door facing me some thirty feet ahead. And that front door was now open. In the aperture, the key of the front door still in his hand, a man stood silhouetted against the faint glow of the street-lamps outside, looking at me.

CHAPTER FOUR

The Poison-Bottle

"Who's there?" a voice said with a quick and shaky start.

For reply I pressed the button of my lantern, turning it sideways so that he could see the uniform. If it had been chosen deliberately, I could have selected no better or more reassuring garb. I heard a sort Of 'Pluh!' of relief. The newcomer groped after a wall-switch, and the lights went up.

We were in a narrowish hall, somewhat frowsily kept after the spick-and-span exterior. There was a porcelain umbrella stand, and on one wall a Teutonic water-colour, circa 1870, of a girl in billowy skirts dancing before a table at which sat two resplendent officers with spiked helmets and beer-mugs. In the doorway — he still seemed reluctant to close it — the newcomer stood blinking.

He was a young man, small and slight, but his air or clothes had a portentousness which made him seem much Older. When not frightened (as he was now), his manner would be grave and somewhat superior. He wore his hair slicked down, parted at the side and brought across his forehead in a slight curve after the fashion of the Old-style barman. His features were sharp, rather hollowed under the cheek-bones, but with good-natured, cocky eyes and a cocky shoulder. No one, he seemed to say, would get the better of him. He wore careful dark clothes, with a wing collar and black tie: also, he carried a bowler hat and gloves. His accent was the accent of London. This, beyond doubt, was Hogenauer's servant, who was supposed to be out with a girl. If I had gone through with my burglary scheme, I should have had a very thin time of it.

"You put the wind up me, you did," he declared accusingly. "What's the game?"

"This door was open," I explained. "I looked in to make sure everything was all right. We're after somebody in the neighbourhood, and..’