Fear to Tread — Michael Gilbert

The story of how Mr. Weatherall, the headmaster of a school, but otherwise an ordinary man, was introduced to a huge nationwide black market operation. It seems that anything goes so as to ensure profits and the continuance of the fraud in what amounts to crime on a vast and organised scale. Moreover, was the victim run over by a train before, or after, he died? And can Mr. Weatherall succeed in getting to the heart of the matter in a one man battle against such odds?