Kemp’s face became white. He tried to grip the door handle with both hands. For a moment he stood lugging. Then the door gave six inches. But he got it closed again. The second time it was jerked a foot wide, and the dressing gown came wedging itself into the opening. His throat was gripped by invisible fingers, and he left his hold on the handle to defend himself. He was forced back, tripped and pitched heavily into the corner of the landing. The empty dressing gown was flung on the top of him.

Halfway up the staircase was Colonel Adye, the recipient of Kemp’s letter, the chief of the Burdock police. He was staring aghast at the sudden appearance of Kemp, followed by the extraordinary sight of clothing tossing empty in the air. He saw Kemp felled, and struggling to his feet. He saw him rush forward, and go down again, felled like an ox.