'Sir, my father let me help drive our motor last Easter, sir.'

'Sir, who do you think it is?'

An isolated genius (imitating the engine): 'Pr-prr! Pr-prr! Pr-prr!'

I was on the point of distributing bad marks (the schoolmaster's stand-by) broadcast, when a curious sound checked me. It followed directly upon the opening of the front door. I heard White's footsteps crossing the hall, then the click of the latch, and then—a sound that I could not define. The closed door of the classroom deadened it, but for all that it was audible. It resembled the thud of a falling body, but I knew it could not be that, for in peaceful England butlers opening front doors did not fall with thuds.

My class, eager listeners, found fresh material in the sound for friendly conversation.

'Sir, what was that, sir?'

'Did you hear that, sir?'

'What do you think's happened, sir?'

'Be quiet,' I shouted. 'Will you be—'

There was a quick footstep outside, the door flew open, and on the threshold stood a short, sturdy man in a motoring coat and cap. The upper part of his face was covered by a strip of white linen, with holes for the eyes, and there was a Browning pistol in his hand.