"If there is one thing," replied her amiable papa, "about this miserable and untrustworthy vehicle which can be relied upon at all, it is the efficiency of the brakes." They set off with a jerk. * * * * * Meanwhile Philip, a little startled at the reception accorded to his tacit offer of assistance, was running down Wickmore Hill. It was a long descent--nearly three miles--but was not steep, and there were no sharp curves until near the bottom. It was a useful spot for brake-tests. "I wonder who that old ass was," mused Philip. "Rum bird. One of our cars, too. There was something familiar about his voice. Road-hog, indeed!" Philip grunted indignantly, for he was a virtuous motorist. "Now I will really hog it a bit: this is a lovely piece of road. I'll let the old car rip for a couple of hundred yards and then see what the Ought-to-Scrap-It will do. There was a girl with him, too. I wonder what her face was like, behind that thick blue veil. Now, then, old friend, put your back into it!" He patted the steering-wheel affectionately. "Off you go!... No, steady! Wait a minute." He closed down the throttle, for another car was coming down the hill behind him, and he intended to let it pass in order to have a clear road for his own operations. He looked round. "What in thunder--" he began. All was not well with the oncoming car. The horn was being blown unceasingly, and some one appeared to be shouting. As Philip looked, he saw that it was the Britannia car which he had passed at the top of the hill. It was going thirty miles an hour and swaying a little from side to side. Next moment it was past him. The gentleman at the wheel turned to Philip as they shot by. "We are running away, damn you!" he bawled. It was what geometricians call a self-evident proposition, though why Philip should be damned because an incompetent stranger had allowed his car to get out of control was not readily apparent. Still, there was no time to sift the matter. Something must be done--promptly--or there would be a hideous disaster. Besides, the man at the wheel was no stranger. Philip recognized him now. Philip's foot came down upon the accelerator, and the long low car leaped down the hill. Philip's mind was suddenly and tensely clear. There was only one thing to do, and the Meldrum Ought-to-Scrap-It, Don't-You-Forget-It Brake would have to do it. Otherwise--! "Lucky there's no sharp turn for nearly two miles," he muttered to himself between his locked teeth. "Pray God we meet nothing coming up the other way! Now to get past! My word, they are swinging!" Next moment he was abreast of the flying car. "Get right behind me, if you can," he shouted, "and I'll try to stop you."