The train went slowly rumbling by; who looked out of the windows Rodney neither knew nor cared. He was conscious of the guard's van passing, then the train had gone. He could see the tail lights moving quicker and quicker through the darkness. He himself continued motionless. He had realised by now that it was not his uncle who had alighted; that it was the door of the next compartment which had been opened. He could not believe that his own movements had been observed. He doubted if they could have been seen by a person who had not actually got his head out at the moment--even by his next door neighbour. He was certain that no head had been out. The thing had been a coincidence--a strange one, but nothing more. Someone also had reasons for wishing to quit the train in an unusual manner; someone who was unaware that he was out already. The chances were that he had not been noticed; that, if he kept quite still, he would not be noticed. The stranger would blunder along without ever becoming cognisant of his near neighbourhood; whichever way the stranger went, he would go the other. Now that the train had left, it was very still in the tunnel; the air was close, full of smoke, which was bad both for the throat and the eyes. Something had dropped once or twice on Rodney's shoulder. He had heard that it was sometimes damp in tunnels; possibly it was moisture dropping from the brickwork overhead. He would have liked to move so as to avoid it, but was reluctant to make a sound--till the stranger had moved. He wondered what the stranger was doing; silence continued for what seemed to him to be a preternatural length of time. Possibly, less fortunate than himself, the stranger had been hurt in alighting, which explained the stillness. If that were so, his own position might be difficult. If he moved first the stranger might claim his help, might make a fuss if he refused it--such a fuss that the fact that he had left the train would be discovered. Still not a sound. Momentarily the situation was becoming more delicate. He could not remain crouched down like that for ever, with big drops of something falling on to his shoulder. What should he do? The question was answered for him. "Caught you!" The words were whispered close to his ear. He stood straight up suddenly, startled half out of his wits. His impulse was to fly--anywhere, anyhow. Then that wonderful presence of mind of his, which never left him long, came back; he realised that haste on his part might involve disaster. He stood bolt upright, quite still, with fists clenched, prepared for anything. Something came; fingers were laid upon his coat-sleeve. He showed no sign of resenting their coming, their touch was so soft that it hardly suggested danger. A voice came to him through the darkness, the one which had so startled him by whispering in his ear. "That was a capital idea of yours--capital."