"I don't know," she said; "but I think there must be some way in and out of the house under there, for I am certain he was in bed less than an hour ago, because when Dora left me she was going to see that her father was all right for the night, and if she hadn't found him in his room, I am sure she would have been alarmed and would have come back to me. I—I saw him come out of there a little while ago. I was sitting on the verandah waiting for you. I started to follow him across the lawn, and then I thought I had no right to do so, and then I saw you, and—and I forgot all about him."
Captain Francis Newcombe was a master of facial expression. He became instantly grave and concerned.
"Well, I should say then," he stated thoughtfully, "that, from what I've just seen, and from what you wrote in your letter about the fabulous sum of money he keeps about him, he ought to have a good deal of medical attention, and the money taken from him and put in some safe place. Don't you know Miss Marlin well enough to suggest something like that?"
Polly Wickes shook her head quickly.
"Oh, you don't understand, guardy!" she said anxiously. "He has had medical attention. The very best specialist from New York has been here since I wrote you. And he says there is really absolutely nothing that can be done. Mr. Marlin is just the dearest old man you ever knew. It's just on that one subject, not so much money as finance, though I don't quite understand the difference, that he is insane. If he were taken away from here and shut up anywhere it would kill him. And, as Doctor Daemer said, what better place could there be than this? And anyway Dora wouldn't hear of it. And as for taking the money away from him, nobody knows where it is."
Captain Francis Newcombe was staring at the bushes that fringed the verandah.
"Oh!" he said quietly. "That puts quite a different complexion on the matter. I didn't understand. I gathered from your letter that the money was more or less always in evidence. In fact, I think you said he showed it to you—a half million dollars in cash."
"So he did," Polly answered; "but that's the only time I ever saw it; and I don't think even Dora has ever seen it more than once or twice. He has got it hidden somewhere, of course; but as it would be the very worst thing in the world for him to get the idea into his head that any one was watching him in an effort to discover his secret, Dora has been very careful to show no signs of interest in it. Doctor Daemer warned her particularly that any suspicions aroused in her father's mind would only accentuate the disease. Oh, guardy, it's a terribly sad case; and insanity is such a horribly strange thing! He never seems to—"
Polly was still talking. Captain Francis Newcombe inclined his head from time to time in assumed interest. He was no longer listening. Polly, the beauty of the night, his immediate surroundings, were, for the moment, extraneous things. His mind was at work. Incredible luck! The problem that had troubled him, that he had never really solved, that he had, indeed, finally decided must be left to circumstances as he should find them here and be then governed thereby, was now solved in a manner that far exceeded anything he could possibly have hoped for. To obtain the actual possession of the money from a fuddle-brained old idiot had never bothered him—that was a very simple matter. But to get away with the money after the robbery had been committed had not appeared so simple. Some one on the island must be guilty. The circle would be none too wide. He must emerge without a breath of suspicion having touched him. Not so simple! There would have been a way, of course; wits and ingenuity would have supplied it—but that had been the really intricate part of the undertaking. And now—incredible luck! He had naturally assumed that the household knew where the old madman kept his money; naturally assumed that there would be a beastly fuss and uproar over its disappearance—but now there would be nothing of the kind. It might take a few days to solve the old fool's secret, but in the main that would be child's play; after that, if by any unfortunate chance an accident happened to Mr. Jonathan P. Marlin, the whereabouts of the money would forever remain a mystery—save to one Captain Francis Newcombe. No one could, or would, be accused of having taken it!
"... Guardy, you quite understand, don't you?" ended Polly Wickes.