Louisa stepped out with an honest British tread, hands buried in the pockets of her serviceable ulster, head bent against the sudden gusts of wind. She did not mind the darkness of the ill-lighted, wide boulevard, and had every intention of covering the two miles in a little more than half an hour.

How the time sped! It seemed as if she had only just left the hotel, and already surely not a quarter of a mile away she could see glimmering the lights of the Place Namur, the half-way point of her walk.

She was in the Boulevard Waterloo where private houses with closed porte-cochères add nothing to the municipal lighting of the thoroughfare.

Trams had been rushing past her in endless succession: but now there was a lull. Close by her a taxi-auto whizzed quickly past and came to a standstill some hundred yards away, near the pavement, and not far from an electric light standard.

Louisa, with vacant eyes attached on that cab, but with her mind fixed on a particular room in a particular house in Grosvenor Square where lived a man of the name of Luke de Mountford, continued her walk. Those same vacant eyes of hers presently saw the chauffeur of the taxi-auto get down from his box and open the door of the cab, and then her absent mind was suddenly brought back from Grosvenor Square, London, to the Boulevard Waterloo in Brussels, by a terrible cry of horror which had broken from that same chauffeur's lips. Instinctively Louisa hurried on, but, even as she did so, a small crowd which indeed seemed to have sprung from nowhere had already gathered round the vehicle.

Murmurs of "What is it? What is it?" mingled with smothered groans of terror, as curiosity caused one or two of the more bold to peer into the gloomy depths of the cab. Shrill calls brought a couple of gardiens to the spot. In a moment Louisa found herself a unit in an eager, anxious crowd, asking questions, conjecturing, wondering, horror-struck as soon as a plausible and graphic explanation came from those who were in the fore-front and were privileged to see.

"A man—murdered——"

"But how?"

"The chauffeur got down from his box . . . and looked in . . . ah, mon Dieu!"

"What did he see?"