Uncle Jack gets back into the car and you drive on up towards the observatory. You watch the breathtaking mountain scenery fly by, but your uncle hardly notices it. Puffing on his pipe, he is miles away.
     Suddenly the engine sputters and the car lurches to a halt. Uncle Jack tries the ignition, but it is dead. 'What on Earth - ?' he murmurs to himself.
     At just that moment a sleek Porsche pulls up beside you. You and your uncle stand baffled -for there is no-one at the wheel!

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