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256 it until the very last moment, midnight on the 28th, in fact. You'll understand why in a minute. You see, I've figured it out that those things of Tuppence's are a plant too, and she's no more drowned than I am. The way I reason is this: as a last chance they'll let Jane Finn escape in the hope that she's been shamming this memory stunt, and that once she thinks she's free she'll go right away to the cache. Of course it's an awful risk for them to take, because she knows all about them—but they're pretty desperate to get hold of that treaty. But if they know that the papers have been recovered by us, neither of those two girls' lives will be worth an hour's purchase. I must try and get hold of Tuppence before Jane escapes.

"I want a repeat of that telegram that was sent to Tuppence at the Ritz. Sir James Peel Edgerton said you would be able to manage that for me. He's frightfully clever.

"One last thing—please have that house in Soho watched day and night.

"Yours, etc., 1em

The Prime Minister looked up.

"The enclosure?"

Mr. Carter smiled dryly.

"In the vaults of the Bank. I am taking no chances."

"You don't think"—the Prime Minister hesitated a minute—"that it would be better to open it now? Surely we ought to secure the document, that is, provided the young man's guess turns out to be correct, at