“Exactly!” exclaimed Hanslet warmly. “I see that you appreciate my point as clearly as I do myself. But now we have a fresh line of investigation. You yourself are added to the list of those who have received the counter. Can you explain why you should have been singled out?”

Mr. Ludgrove shook his head. “As you may suppose, the subject has occupied my thoughts ever since I found the counter,” he replied. “I am an old man, as I have said before, and for the last twenty years or more I have led a retired life, retired, I mean, in the sense that I have taken no part in the affairs of the world. I have had enemies as well as friends; few men who have reached my years could say otherwise. But most of the contemporaries of my youth are dead, and in any case I do not believe that any of the enemies I may have made would be so vindictive as to seek my life.”

“Let us look at it another way, then,” said Hanslet. “Can you imagine any way in which you, in common with the six men who have already died, could have made an unconscious enemy?”