He ran a few steps in that direction, slowed down for a lagging second or two, spurted again, and ducked around the corner of a big machine shop on the left of the road a little below the guard house. Back of this ran the completed portion of a high board fence topped with barbed wire which would ultimately encircle the entire yard. A moment before he had glimpsed, slipping along that fence, the figure of a man whose furtive movements roused instant suspicion. He might just possibly be one of the guards, but to Steve, remembering the three he had seen running that same way a little while before, it seemed much more likely that he was one of the spies heading for the end of the fence and freedom.