It was after three o'clock when, weary and sick at heart, the husband and wife reached home. Several hours passed before Tuppence could sleep. She lay tossing from side to side, seeing always that flower like face with the horror stricken eyes.

The dawn was coming in through the shutters when Tuppence finally dropped off to sleep. After the excitement, she slept heavily and dreamlessly. It was broad daylight when she awoke to find Tommy, up and dressed, standing by the bedside, shaking her gently by the arm.

"Wake up, old thing. Inspector Marriot and another man are here and want to see you."

"What time is it?"

"Just on eleven. I'll get Alice to bring you your tea right away."

"Yes, do. Tell Inspector Marriot I'll be there in ten minutes."

A quarter of an hour later, Tuppence came hurrying into the sitting room. Inspector Marriot who was sitting looking very straight and solemn, rose to greet her.

"Good morning, Mrs. Beresford. This is Sir Arthur Merivale."

Tuppence shook hands with a tall thin man with haggard eyes and preying hair.

"It's about this sad business last night," said Inspector Marriot. "I want Sir Arthur to hear from your own lips what you told me-the words the poor lady said before she died. Sir Arthur has been very hard to convince."

"I can't believe," said the other, "and I won't believe, that Bingo Hale ever hurt a hair on Vere's head."

Inspector Marriot went on.

"We've made some progress since last night, Mrs. Beresford," he said. "First of all we managed to identify the lady as Lady Merivale. We communicated with Sir Arthur here. He recognised the body at once, and was horrified beyond words, of course. Then I asked him if he knew anyone called Bingo."

"You must understand Mrs. Beresford," said Sir Arthur, "that Captain Hale, who is known to all his friends as Bingo, is the dearest pal I have. He practically lives with us. He was staying at my house when they arrested him this morning. I cannot but believe that you have made a mistake-it was not his name that my wife uttered."

"There is no possibility of mistake," said Tuppence gently. "She said 'Bingo did it-' "

"You see, Sir Arthur," said Marriot.

The unhappy man sank into a chair and covered his face with his hands.

"It's incredible. What earthly motive could there be? Oh! I know your idea, Inspector Marriot. You think Hale was my wife's lover, but even if that were so-which I don't admit for a moment-what motive was there for killing her?"

Inspector Marriot coughed.

"It's not a very pleasant thing to say, sir. But Captain Hale has been paying a lot of attention to a certain young American lady of late-a young lady with inconsiderable amount of money. If Lady Merivale liked to turn nasty, she could probably stop his marriage."

"This is outrageous, Inspector."

Sir Arthur sprang angrily to his feet. The other calmed him with a soothing gesture.

"I beg your pardon, I'm sure, Sir Arthur. You say that you and Captain Hale both decided to attend this show. Your wife was away on a visit at the time, and you had no idea that she was to be there?"

"Not the least idea."

"Just show him that advertisement you told me about, Mrs. Beresford."

Tuppence complied.

"That seems to me clear enough. It was inserted by Captain Hale to catch your wife's eye. They had already arranged to meet there. But you only made up your mind to go the day before, hence it was necessary to warn her. That is the explanation of the phrase "Necessary to finesse the King." You ordered your costume from a theatrical firm at the last minute, but Captain Hale's was a home made affair. He went as the Gentleman Dressed in Newspaper. Do you know, Sir Arthur, what we found clasped in the dead lady's hand? A fragment torn from a newspaper. My men have orders to take Captain Hale's costume away with them from your house. I shall find it at the Yard when I get back. If there's a tear in it corresponding to the missing piece-well, it'll be the end of the case."

"You won't find it," said Sir Arthur. "I know Bingo Hale."

Apologising to Tuppence for disturbing her, they took their leave.

Late that evening, there was a ring at the bell, and somewhat to the astonishment of the young pair, Inspector Marriot once more walked in.

"I thought Blunt's Brilliant Detectives would like to hear the latest developments," he said, with a hint of a smile.

"They would," said Tommy. "Have a drink?"

He placed materials hospitably at Inspector Marriot's elbow.

"It's a clear case," said the latter, after a minute or two. "Dagger was the lady's own-the idea was to have made it look like suicide, evidently, but thanks to you two being on the spot, that didn't come off. We've found plenty of letters -they'd been carrying on together for some time, that's clear-without Sir Arthur tumbling to it. Then we found the last link-"

"The last what?" said Tuppence sharply.

"The last link in the chain-that fragment of the Daily Leader. It was torn from the dress he wore-fits exactly. Oh! yes, it's a perfectly clear case. By the way, I brought round a photograph of those two exhibits-I thought they might interest you. It's very seldom that you get such a perfectly clear case."

"Tommy," said Tuppence, when her husband returned from showing the Scotland Yard man out. "Why do you think Inspector Marriot keeps repeating that it's a perfectly clear case?"

"I don't know. Smug satisfaction, I suppose."

"Not a bit of it. He's trying to get us irritated. You know, Tommy, butchers, for instance, know something about meat, don't they?"

"I should say so, but what on earth-"

"And in the same way, greengrocers know all about vegetables, and fishermen about fish. Detectives, professional detectives, must know all about criminals. They know the real thing when they see it-and they know when it isn't the real thing. Marriot's expert knowledge tells him that Captain Hale isn't a criminal-but all the facts are dead against him. As a last resource Marriot is egging us on, hoping against hope that some little detail or other will come back to us- something that happened last night-which will throw a different light on things. Tommy, why shouldn't it be suicide, after all?"

"Remember what she said to you."

"I know-but take that a different way. It was Bingo's doing-his conduct that drove her to kill herself. It's just possible."

"Just. But it doesn't explain that fragment of newspaper."

"Let's have a look at Marriot's photographs. I forgot to ask him what Hale's account of the matter was."

"I asked him that in the hall just now. Hale declared he had never spoken to Lady Merivale at the show. Says somebody shoved a note into his hand which said: "Don't try and speak to me to-night. Arthur suspects." He couldn't produce the piece of paper, though, and it doesn't sound a very likely story. Anyway, you and I know he was with her at the Ace of Spades because we saw him."

Tuppence nodded and pored over the two photographs. One was a tiny fragment with the legend DAILY LE-and the rest torn off. The other was the front sheet of the Daily Leader with the small round tear at the top of it. There was no doubt about it. The two fitted together perfectly.

"What are all those marks down the side?" asked Tommy.

"Stitches," said Tuppence. "Where is was sewn to the others, you know."

"I thought it might be a new scheme of dots," said Tommy. Then he gave a slight shiver. "My word, Tuppence, how creepy it makes one feel. To think that you and I were discussing dots and puzzling over that advertisement all as lighthearted as anything."

Tuppence did not answer. Tommy looked at her, and was startled to observe that she was staring ahead of her, her mouth slightly open, and a bewildered expression on her face.

"Tuppence," said Tommy gently, shaking her by the arm. "What's the matter with you? Are you just going to have a stroke or something?"

But Tuppence remained motionless. Presently she said in a far away voice.

"Denis Riordan."

"Eh?" said Tommy staring.

"It's just as you said. One simple innocent remark! Find me all this week's Daily Leaders."

"What are you up to?"

"I'm being McCarty. I've been worrying round, and thanks to you, I've got a notion at last. This is the front sheet of Tuesday's paper. I seem to remember that Tuesday's paper was the one with two dots in the L of LEADER. This has a dot in the D of DAILY-and one in the L too. Get me the papers and let's make sure."

They compared them anxiously. Tuppence had been quite right in her remembrance.

"You see? This fragment wasn't torn from Tuesday's paper."

"But Tuppence, we can't be sure. It may merely be different editions."

"It may-but at any rate it's given me an idea. It can't be coincidence-that's certain. There's only one thing it can be if I'm right in my idea. Ring up Sir Arthur, Tommy. Ask him to come round here at once. Say I've got important news for him. Then get hold of Marriot. Scotland Yard will know his address if he's gone home."

Sir Arthur Merivale, very much intrigued by the summons, arrived at the flat in about half an hour's time. Tuppence came forward to greet hire.

"I must apologise for sending for you in such a peremptory fashion," she said. "But my husband and I have discovered something that we think you ought to know at once. Do sit down."

Sir Arthur sat down, and Tuppence went on.

"You are, I know, very anxious to clear your friend."

Sir Arthur shook his head sadly.

"I was, but even I have had to give in to the overwhelming evidence."

"What would you say if I told you that chance has placed in my hands a piece of evidence that will certainly clear him of all complicity?"

"I should be overjoyed to hear it, Mrs. Beresford."

"Supposing," continued Tuppence, "that I had come across a girl who was actually dancing with Captain Hale last night at twelve o'clock-the hour when he was supposed to be at the Ace of Spades."