"Where were you?" I asked quickly.

"Harrow, sir."

I nodded. Here was another astounding fact for consideration when I was alone.

"And then, after a time," Pring continued, "the Sant Iago tramp steamer freighter came up from way down South and rescued us. After that we sighted the lights of Mr. Van Adams' air yacht, the May Flower, and in answer to our signal he came down and took me and Rickaby aboard."

"Quite," said the laconic millionaire.

"To-night, Captain Pring, I shall want a long talk with you. Now I must surrender you to Sir Joshua. For the present, I want you all three to give me your words of honour that you will tell no one at all anything about the appearance or speed of the ship, that her engines were silent, or you suspect the ruffians on her to be English. That is most important. In fact, I must make it an order, under the powers with which I am invested by the Secretary of State. As an order, it cannot apply, to you, Mr. Van Adams, but you have been so kind and helpful hitherto that I feel sure you'll give me your promise? You must see how necessary it is."

Mr. Van Adams was going to use his word-of-all-work, I saw it coming, when he changed his mind.

"I'm on," he said instead.

The two pilots gave me their assurances, and we walked out of the office together. As we went along the terrace Pring pointed down to the sea-drome, where the millionaire's air yacht, a beautiful boat, painted cream colour and black, was now resting at her moorings.