"Oh, they're not jokes. You have no idea as to the trend of this?"
"No." 1
Dr. Fell scribbled rapidly on a sheet of paper, and passed it over. i
"Here, for your further enlightenment," he said, frowning, "I have tabulated eight clues. Eight suggestions, if you; will. Not one of 'em is direct evidence — it's the direct evidence I'm looking for you to supply in your next instalment of the story. I feel fairly certain you will mention the evidence I want; and my hunch is so strong that I — like several others — will risk Whistler's official head on it. Eh?"
Morgan took the paper, which read
1. The Clue of Suggestion.
2. The Clue of Opportunity.
3. The Clue of Fraternal Trust.
4. The Clue of Invisibility.
5. The Clue of Seven Razors.