The other's voice was scarcely audible.
"Who are you?"
Garth threw back his coat lapel, displaying momentarily his badge.
Black's voice rose on a shrill note.
"It's a lie! It's a lie!"
Garth shook his head.
"I watched you last night," he said, "planting money here and there—a pretty, generous fancy, just to give people the joy of finding it. Men don't do such things in their right senses. I've heard of it, but the fact that you were the brother-in-law of the head of an organization that was after these cases offered a more likely explanation. Put me off the track. Thought you were working for him. Now that I've had a good look at you, there's no question."
Black made a last pitiful effort.
"This is blackmail."
"I have my price," Garth admitted.