Carefully he unfastened the French window, and bending low so as to escape the observation of any person passing by, we both crept along the narrow balcony until, by swinging from one balustrade to the other, we found ourselves standing over Hartmann's portico.
Even from where we stood we could hear voices. Forward we crept again until we were outside the windows of the drawing-room, crouching so that no inquisitive policeman could detect us.
The blind of the window at which I listened did not fit well, therefore, through the small crack, I was enabled to peer within. The room was a large, well-furnished one with a fire burning brightly; near it stood a large roll-top writing-table at which sat a fat, flabby, sardonic-faced man of about fifty-five. He had grey eyes full of craft and cunning, a prominent nose, and a short-cropped grey beard. Ray whispered that it was the great Hartmann.
Near the fire, seated nervously on the extreme edge of a chair, was a respectably dressed man, a German evidently, with his hat in his hand. The man presented the appearance of a hard-working mechanic, and was obviously ill at ease.
We watched them in conversation, but could not distinguish one single word of what was said. All we could gather was that the fat man was overbearing in his manner, and that the visitor was most humble and subservient against his will.
For a full half-hour we watched, but unable to gather anything further, we were compelled to return to the house next door and regain the street, where for still twenty minutes longer we waited for the visitor's exit. When at last he came forth we followed him to the corner of Knightsbridge, opposite the Hyde Park Hotel, where he boarded a motor-bus, from which he eventually descended at the corner of Gray's Inn Road walking thence to a house in Harpur Street, Bloomsbury, where we later on discovered he lodged, under the name of Leon Karff.
The nature of the mission entrusted to this man, if one had actually been entrusted to him, was a mystery, yet it was a curious fact that "Harpur Street" appeared upon that scrap of paper which to us was such an enigma.
Next morning at six o'clock, I was already idling, at the corner of Harpur Street and Theobalds Road, but not until three hours later did the foreigner emerge and walk toward Holborn. Thence he took a motor-bus back to Sloane Street, and calling upon Hartmann, spent another half an hour with him.
And afterwards he went straight home. It was then about noon, and having an engagement in Court, I was compelled to relinquish my vigil. But at a little after five Ray entered our chambers, exclaiming:
"As I expected! That man Karff has been to see Steinheim in the hospital. I was there awaiting him, believing that he might visit him. Apparently the injured man has given him certain instructions."