Chapter 21

"The Professor had made a discovery, darling," said Hugh gravely, "which threatened to ruin everyone who was concerned in the diamond industry. He had found out a method of making diamonds artificially at a very low cost. To show you how seriously the trade regarded it, he was offered two hundred and fifty thousand pounds to suppress it. That he refused to do. This morning he received a letter threatening his life. This afternoon he died, apparently as the result of a ghastly accident. But--I wonder." "Does any…