The Professor shuddered, and increased his pace. This lonely heath was no place in which to indulge in morbid thoughts. His life might be in danger, but somehow he felt that it was not here that the blow would fall. If his theory were correct, if he had gauged aright the psychology of his adversary, it would not be thus that he would meet his death, here where there was none to witness the blow. Despite the almost threatening aspect of the country, deepening in tone every instant as the sun sank lower behind the distant hills, there was no vestige of any real danger. The shadows that lurked amid the gorse and heather were but the shadows of his own fears.