“The Citroen went into second and remained there; slowly we puffed up the long ascent. We had gone about a mile, when we became aware of a noise coming up from the valley, a noise like the noise of massed machine-guns. It grew louder and louder. A minute later a huge red Alfa Romeo road racer, looking suspiciously like the machine that had just won the Grand Prix d’ Europe, roared past at a speed that cannot have been less than fifty miles an hour. It was evidently being driven by a genius; for, looking up, we saw the scarlet monster negotiating turn after hairpin turn in the zigzag road…