“Up to that point everything seemed plain sailing. I had, as I believed—and as it turned out in the end—got the thing cut and dried against the gang at the cottage. The case wasn't complete; but, short of getting some direct evidence from one of the two actual murderers, I didn't see how I was to make it absolutely water-tight. They'd been a bit too clever for a jury, I feared. And, of course, the Peter Hay case was getting clearer also, once you could assume that these fellows would stick at nothing.
“Then, out of the blue, came the shooting of Cargill. That wouldn't fit in with the rest of the business. Cargill wasn't a pawn like Staveley and Billingford. He was watching one end of the business for them—keeping an eye on us for one thing; and, besides, I was becoming more and more sure that he was a brother of the faceless fellow, and possibly the brains of the gang. They had a use for him; they wouldn't shoot him. But, then, who did?
“And at that point I took a long cast back and raked up again a possibility I'd dismissed at an earlier stage. Suppose that both the claimant and Paul Fordingbridge were wrong 'uns, what then? Suppose friend Paul had been at some hanky-panky with the funds he held in trust for his nephew. Then, whether the claimant was an impostor or not, it would be very convenient for friend Paul if the claimant left this vale of tears. And the claimant and Cargill were much alike in build; and Cargill was shot after leaving the cottage. There might be something in it. And when I found that friend Paul carried a pistol in his pocket, and didn't care who knew it, by the look of his jacket, I began to think furiously.
“I didn't blame Paul for carrying arms. In his position, with that gang at the cottage in the offing, I think it was a wise precaution; for he must have known that he was the main stumbling-block in the claimant's road. But I don't think that he kept within the limits of precaution. I think he decided to get ahead of them by knocking out the claimant—and after that he would be able to live in peace as heretofore.
“However, I never had time to probe that matter any further, for the next business was the disappearance of friend Paul. I think I have a fair notion how that was managed.
“They approached him and asked for an interview. He sent the claimant a scrap of paper:
‘Meet me at the Blowhole to-night at 11 p.m. Come alone.’
The last two words give you the key to friend Paul's feelings about them. One man he could keep an eye on, and he didn't propose to have any more present. Of course, they filed that note and used it again later, as you'll remember.
“Probably the claimant met him at the Blowhole and suggested a walk over the open sands as a good way of avoiding eavesdroppers. Paul would feel safer in the open. By the time they reached the old wreck the claimant would have got him interested, or else his natural fears would be dissipated. At the hulk the claimant obviously turned, as though to go back across the sands, and Paul turned with him. Then, from behind the hull, Aird stole out and did le coup du Père François.”
“What's that?” Wendover demanded. “You talked a lot about Père François and Sam Lloyd's ‘Get off the Earth’ puzzle, I remember.”