Mr. Prohack put his hand over her mouth.

"Stop," said he. "My sweet child, I can save you a lot of trouble. It's all my fault. If I hadn't been a miracle of stupidity the necklace would never have disappeared. This point being agreed to, let us go on to the next. When did you find out your sad loss?"

"It was Miss Winstock who asked me what I'd done with my necklace. I put my hand to my throat, and it was gone. It must have come undone."

"Didn't you say to me a fortnight or so ago that the little safety-chain had gone wrong?"

"Did I?" said Eve, innocently.

"Did you have the safety-chain repaired?"

"I was going to have it done to-morrow. You see, if I'd sent it to be done to-day, then I couldn't have worn the necklace to-night, could I?"

"Very true," Mr. Prohack concurred.

"But who could have taken it?"

"Ah! Are you sure that it isn't lying on the floor somewhere?"

"Every place where I've been has been searched--thoroughly. It's quite certain that it must have been picked up and pocketed."

"Then by a man, seeing that women have no pockets--except their husbands'. I'm beginning to feel quite like a detective already. By the way, lady, the notion of giving a reception in a house like this without a detective disguised as a guest was rather grotesque."

"But of course I had detectives!" Eve burst out. "I had two private ones. I thought one ought to be enough, but as soon as the agents saw the inventory of knicknacks and things, they advised me to have two men.

One of them's here still. In fact he's waiting to see you. The Scotland Yard people are very annoying. They've refused to do anything until morning."

That Eve should have engaged detectives was something of a blow to the masculine superiority of Mr. Prohack. However, he kept himself in countenance by convincing himself in secret that she had not thought of the idea; the idea must have been given to her by another person--probably Mimi, who nevertheless was also a woman.

"And do you seriously expect me to interview a detective in the middle of the night?" demanded Mr. Prohack.

"He said he should like to see you. But of course if you don't feel equal to it, my poor boy, I'll tell him so."

"What does he want to see _me_ for? I've nothing to do with it, and I know nothing."

"He says that as you bought the necklace he must see you--and the sooner the better."

This new aspect of the matter seemed to make Mr. Prohack rather thoughtful.

III

Eve brought in to her husband, who had improved his moral stamina and his physical charm by means of the finest of his dressing-gowns, a dark, thin young man, clothed to marvellous perfection, with a much-loved moustache, and looking as fresh as if he was just going to a party. Mr.

Prohack of course recognised him as one of the guests.

"Good morning," said Mr. Prohack. "So _you_ are the detective."

"Yes, sir," answered the detective, formally.

"Do you know, all the evening I was under the impression that you were First Secretary to the Czecho-Slovakian Legation."

"No, sir," answered the detective, formally.

"Well! Well! I think there is a proverb to the effect that appearances are deceptive."

"Is there indeed, sir?" said the detective, with unshaken gravity. "In our business we think that appearances ought to be deceptive."

"Now talking of your business," Mr. Prohack remarked with one of his efforts to be very persuasive. "What about this unfortunate affair?"

"Yes, sir, what about it?" The detective looked askance at Eve.

"I suppose there's no doubt the thing's been stolen--By the way, sit on the end of the bed, will you? Then you'll be near me."

"Yes, sir," said the detective, sitting down. "There is no doubt the necklace has been removed by some one, either for a nefarious purpose or for a joke."

"Ah! A joke?" meditated Mr. Prohack, aloud.

"It certainly hasn't been taken for a joke," said Eve warmly. "n.o.body that I know well enough for them to play such a trick would dream of playing it."

"Then," said Mr. Prohack, "we are left all alone with the nefarious purpose. I had a sort of a notion that I should meet the nefarious purpose, and here it is! I suppose there's little hope?"

"Well, sir. You know what happens to a stolen pearl necklace. The pearls are separated. They can be sold at once, one at a time, or they can be kept for years and then sold. Pearls, except the very finest, leave no trace when they get a fair start."

"What I can't understand," Eve exclaimed, "is how it could have dropped off without me noticing it."

"Oh! I can easily understand that," said Mr. Prohack, with a peculiar intonation.

"I've known ladies lose even their hair without noticing anything," said the detective firmly. "Not to mention other items."

"But without anybody else noticing it either?" Eve pursued her own train of thought.

"Somebody did notice it," said the detective, writing on a small piece of paper.

"Who?"

"The person who took the necklace."

"Well, of course I know that," Eve spoke impatiently. "But who can it be? I feel sure it's one of the new servants or one of the hired waiters."

"In our business, madam, we usually suspect servants and waiters last."

Then turning round very suddenly he demanded: "Who's that at the door?"

Eve, startled, moved towards the door, and in the same instant the detective put a small piece of paper into Mr. Prohack's lap, and Mi.

Prohack read on the paper:

"_Should like see you alone_." The detective picked up the paper again.

Mr. Prohack laughed joyously within himself.