The next signpost showed three diagonal white lines, warning her that she ought to be on the inside lane if she intended to leave the freeway at the next junction. She kept the car in the outside lane at a hundred miles per hour until she spotted a large enough gap. Two white lines appeared by the roadside: Diana knew she would have only one chance to make her escape. As she passed the sign with a single white line on it, she suddenly swung across the road at ninety miles per hour, causing cars in the middle and inside lanes to throw on their brakes and blast out their angry opinions. But Diana didn’t care what they thought of her, because she was now traveling down the side road to safety, and the black van was speeding on up the A1.

She laughed out loud with relief. To her right, she could see the steady flow of traffic on the motorway. But then her laugh turned to a scream as she saw the black van cut sharply across the freeway in front of a truck, mount the grass verge, and career onto the side road, swinging from side to side. It nearly drove over the edge and into a ditch but somehow managed to steady itself, ending up a few yards behind her, its lights once again glaring through her rear windshield.

When she reached the beginning of the side road, Diana turned left in the direction of the farm, frantically trying to work out what she should do next. The nearest town was about twelve miles away on the main road, and the farm was only seven, but five of those miles were down a winding unlit country lane. She checked her gas gauge. It was nearing empty, but there should still be enough in the tank for her to consider either option. There was less than a mile to go before she reached the turn, so she had only a minute in which to make up her mind.

With a hundred yards to go, she settled on the farm. Despite the unlit lane, she knew every twist and turn, and she felt confident that her pursuer wouldn’t. Once she reached the farm she could be out of the car and inside the house long before he could catch her. In any case, once he saw the farmhouse, surely he would flee.

The minute was up. Diana touched the brakes and skidded into a country road illuminated only by the moon.