"My dear fellow, my dear fellow," said Tuppence and waved a heavily buttered muffin.

Tommy looked at her for a minute or two, then a broad grin spread over his face and he murmured.

"We do have to be so very careful."

"That's right," said Tuppence delighted. "You guessed. I am the famous Dr. Fortune and you are Superintendent Bell."

"Why are you being Reginald Fortune?"

"Well really because I feel like a lot of hot butter."

"That is the pleasant side of it," said Tommy. "But there is another. You will have to examine horribly smashed faces and very extra dead bodies a good deal."

In answer Tuppence threw across a letter. Tommy's eyebrows rose in astonishment.

"Randolph Wilmott, the American Ambassador. I wonder what he wants."

"We shall know to-morrow at eleven o'clock.

Punctually to the time named, Mr. Randolph Wilmott, United States Ambassador to the Court of St. James, was ushered into Mr. Blunt's office. He cleared his throat and commenced speaking in a deliberate and characteristic manner.

"I have come to you, Mr. Blunt-By the way, it is Mr. Blunt himself to whom I am speaking, is it not?"

"Certainly," said Tommy. "I am Theodore Blunt, the head of the firm."

"I a ways prefer to deal with heads of de-partments," said Mr. Wilmott. "It is more satisfactory in every way. As I was about to say, Mr. Blunt, this business gets my goat. There's nothing in it to trouble Scotland Yard about-I'm not a penny the worse in any way, and it's probably all due to a simple mistake. But all the same, I don't see just how that mistake arose. There's nothing criminal in it, I daresay, but I'd like just to get the thing straightened out. It makes me mad not to see the why and wherefore of a thing."

"Absolutely," said Tommy.

Mr. Wilmott went on. He was slow and given to much detail. At last Tommy managed to get a word in.

"Quite so," he said, "the position is this. You arrived by the liner Nomadic a week ago. In some way your kitbag and the kitbag of another gentleman, Mr. Ralph Westerham whose initials are the same as yours, got mixed up. You took Mr. Westerham's kitbag, and he took yours. Mr. Westerham discovered the mistake immediately, sent round your kitbag to the Embassy, and took away his own. Am I right so far?"

"That is precisely what occurred. The two bags must have been practically identical, and with the initials R.W. being the same in both cases, it is not difficult to understand that an error might have been made. I myself was not aware of what had happened until my valet informed me of the mistake, and that Mr. Westerham-he is a Senator, and a man for whom I have a great admiration-had sent round for his bag and returned mine."

"Then I don't see-"

"But you will see. That's only the beginning of the story. Yesterday, as it chanced, I ran up against Senator Westerham, and I happened to mention the matter to him jestingly. To my great surprise, he did not seem to know what I was talking about, and when I explained, he denied the story absolutely. He had not taken my bag off the ship in mistake for his own-in fact, he had not travelled with such an article amongst his luggage."

"What an extraordinary thing!"

"Mr. Blunt, it is an extraordinary thing. There seems no rhyme or reason in it. Why, if anyone wanted to steal my kitbag, he could do so easily enough without resorting to all this round about business! And anyway, it was not stolen, but returned to me. On the other hand, if it were taken by mistake, why use Senator Westerham's name? It's a crazy business-but just for curiosity I mean to get to the bottom of it. I hope the case is not too trivial for you to undertake?"

"Not at all. It is a very intriguing little problem, capable as you say, of many simple explanations, but nevertheless baffling on the face of it. The first thing, of course, is the reason of the substitution, if substitution it was. You say nothing was missing from your bag when it came back into your possession?"

"My man says not. He would know."

"What was in it, if I may ask?"

"Mostly boots."

"Boots," said Tommy discouraged.

"Yes," said Mr. Wilmott. "Boots. Odd, isn't it?"

"You'll forgive my asking you," said Tommy, "but you didn't carry any secret papers, or anything of that sort sewn in the lining of a boot or screwed into a false heel?"

The Ambassador seemed amused by the question.

"Secret diplomacy hasn't got to that pitch, I hope."

"Only in fiction," said Tommy with an answering smile, and a slightly apologetic manner. "But you see, we've got to account for the thing somehow. Who came for the bag-the other bag, I mean?"

"Supposed to be one of Westerham's servants. Quite a quiet ordinary man, so I understand. My valet saw nothing wrong with him."

"Had it been unpacked, do you know?"

"That I can't say. I presume not. But perhaps you'd like to ask the valet a few questions? He can tell you more than I can about the business."

"I think that would be the best plan, Mr. Wilmott."

The Ambassador scribbled a few words on a card and handed it to Tommy.

"I opine that you would prefer to go round to the Embassy and make your inquiries there? If not, I will have the man,-his name is Richards, by the way-sent round here."

"No, thank you, Mr. Wilmott. I should prefer to go to the Embassy."

The Ambassador rose, glancing at his watch.

"Dear me, I shall be late for an appointment. Well, good bye, Mr. Blunt. I leave the matter in your hands."

He hurried away. Tommy looked at Tuppence who had been scribbling demurely on her pad in the character of the efficient Miss Robinson.

"What about it, old thing?" he asked. "Do you see, as the old bird put it, any rhyme or reason in the proceeding?"

"None whatever," replied Tuppence cheerily.

"Well, that's a start anyway! It shows that there is really something very deep at the back of it."

"You think so?"

"It's a generally accepted hypothesis. Remember Sherlock Holmes and the depth the butter had sunk into the parsley-I mean the other way round. I've always had a devouring wish to know all about that case. Perhaps Watson will disinter it from his notebook one of these days. Then I shall die happy. But we must get busy."

"Quite so," said Tuppence. "Not a quick man, the esteemed Wilmott, but sure."

"She knows men," said Tommy. "Or do I say he knows men. It is so confusing when you assume the character of a male detective."

"Oh! My dear fellow, my dear fellow!"

"A little more action, Tuppence, and a little less repetition."

"A classic phrase cannot be repeated too often," said Tuppence with dignity.

"Have a muffin," said Tommy kindly.

"Not at eleven o'clock in the morning, thank you. Silly case, this. Boots-you know-Why boots?"

"Well," said Tommy, "why not?"

"It doesn't fit. Boots." She shook her head. "All wrong. Who wants other people's boots? The whole thing's mad."

"Perhaps they got hold of the wrong bag?" suggested Tommy.

"That's possible. But if they were after papers, a despatch case would be more likely. Papers are the only things one thinks of in connection with ambassadors."

"Boots suggest footprints," said Tommy thoughtfully. "Do you think they wanted to lay a trail of Wilmott's footsteps somewhere?"

Tuppence considered the suggestion, abandoning her role, then shook her head.

"It seems wildly impossible," she said. "No, I believe we shall have to resign ourselves to the fact that the boots have nothing to do with it."

"Well," said Tommy with a sigh. "The next step is to interview friend Richards. He may be able to throw some light on the mystery."

On production of the Ambassador's card, Tommy was admitted to the Embassy, and presently a pale young man, with a respectful manner, and a subdued voice, presented himself to undergo examination.

"I am Richards, sir, Mr. Wilmott's valet. I understood you wished to see me?"

"Yes, Richards. Mr. Wilmott called on me this morning, and suggested that I should come round and ask you a few questions. It is this matter of the kitbag."

"Mr. Wilmott was rather upset over the affair, I know, sir. I can hardly see why, since no harm was done. I certainly understood from the man who called for the other bag that it belonged to Senator Westerham, but of course I may have been mistaken."

"What kind of a man was he?"

"Middle-aged. Grey-hair. Very good class, I should say-most respectable. I understood he was Senator Westerham's valet. He left Mr. Wilmott's bag and took away the other."

"Had it been unpacked at all?"

"Which one, sir?"

"Well I meant the one you brought from the boat. But I should like to know about the other as well-Mr. Wilmott's own. Had that been unpacked, do you fancy?"

"I should say not, sir. It was just as I strapped it up on the boat. I should say the gentleman-whoever he was-just opened it-realized it wasn't his, and shut it up again."

"Nothing missing? No small article?"

"I don't think so, sir. In fact, I'm quite sure."

"And now the other one. Had you started to unpack that?" "As a matter of fact, sir, I was just opening it at the very moment Senator Westerham's man arrived. I'd just undone the straps."

"Did you open it at all?"

"We just unfastened it together, sir, to be sure no mistake had been made this time. The man said it was all right, and he strapped it up again and took it away."

"What was inside? Boots also?"

"No, sir, mostly toilet things, I fancy. I know I saw a tin of bath salts."

Tommy abandoned that line of research.

"You never saw anyone tampering with anything in your master's cabin on board ship, I suppose?"

"Oh, no, sir."

"Never anything suspicious of any kind?"

"And what do I mean by that, I wonder," he thought to himself with a trace of amusement. "Anything suspicious-just words!"