6
"The next morning we were all hard at work by nine o'clock. The six members of the original team had been supplemented by four regular volunteers from our pool of contacts. One of them was Oliver Pallister who, I realised later, must have been the nighthawks' spy.
"There were too many things about Oliver I didn't like. He was boastful and too given to name dropping; but, more disturbingly, I sensed a calculating coldness in his character lurking just beneath the surface. But he was a hard and willing worker and had been on excavations with Charles and myself in the past. We had enough problems on this dig already, so I buried my dislike and got on with the work.
"During the mid-morning refreshment break Charles drew me aside. He glanced up at the outline of the ringfort and said he'd
