“Blackmail?” I asked.

He nodded.

“And do they blackmail Thorold in the same way?”

Again he nodded in the affirmative.

At last I seemed to be really on the verge of unravelling the mystery which had puzzled me so long—also on the way to discovering the closely-guarded secret of the Thorolds.

After a brief pause, I put another question to him.

“Is all that French gold I have seen, genuine?” I asked. “I know some of it is, because I had some tested.”

“How many?” he inquired, in a tone of surprise.

“Three. They were all good.”

“Most of them are base coin,” he said. “A small proportion only are coin from the French mint.”