When I recovered the use of my senses a few moments later I saw that Colonel Wragge with a face of death, its whiteness strangely stained, had moved closer to me. Dr. Silence stood beside him, an expression of triumph and success in his eyes. The next minute the soldier tried to clutch me with his hand. Then he reeled, staggered, and, unable to save himself, fell with a great crash upon the brick floor.

After the sheet of flame, a wind raged round the building as though it would lift the roof off, but then passed as suddenly as it came. And in the intense calm that followed I saw that the form had vanished, and the doctor was stooping over Colonel Wragge upon the floor, trying to lift him to a sitting position.

“Light,” he said quietly, “more light. Take the shades off.”