“How could you think of anything after falling out of that tree?” cried Tuppence. “I’m sure anyone else would have been killed right off.”

“Well, I guess it doesn’t matter now, anyway,” said Julius. “We’ve got Mrs. Vandemeyer on a string, and that’s all we need.”

“Yes,” said Tuppence, but there was a lack of assurance in her voice.

A silence settled down over the party. Little by little the magic of the night began to gain a hold on them. There were sudden creaks of the furniture, imperceptible rustlings in the curtains. Suddenly Tuppence sprang up with a cry.

“I can’t help it. I know Mr. Brown’s somewhere in the flat! I can feel him.”

“Sure, Tuppence, how could he be? This door’s open into the hall. No one could have come in by the front door without our seeing and hearing him.”

“I can’t help it. I feel he’s here!”

She looked appealingly at Sir James, who replied gravely:

“With due deference to your feelings, Miss Tuppence (and mine as well for that matter), I do not see how it is humanly possible for anyone to be in the flat without our knowledge.”

The girl was a little comforted by his words.

“Sitting up at night is always rather jumpy,” she confessed.

“Yes,” said Sir James. “We are in the condition of people holding a séance. Perhaps if a medium were present we might get some marvellous results.”

“Do you believe in spiritualism?” asked Tuppence, opening her eyes wide.

The lawyer shrugged his shoulders.

“There is some truth in it, without a doubt. But most of the testimony would not pass muster in the witness-box.”

The hours drew on. With the first faint glimmerings of dawn, Sir James drew aside the curtains. They beheld, what few Londoners see, the slow rising of the sun over the sleeping city. Somehow, with the coming of the light, the dreads and fancies of the past night seemed absurd. Tuppence’s spirits revived to the normal.

“Hooray!” she said. “It’s going to be a gorgeous day. And we shall find Tommy. And Jane Finn. And everything will be lovely. I shall ask Mr. Carter if I can’t be made a Dame!”

At seven o’clock Tuppence volunteered to go and make some tea. She returned with a tray, containing the teapot and four cups.

“Who’s the other cup for?” inquired Julius.

“The prisoner, of course. I suppose we might call her that?”

“Taking her tea seems a kind of anticlimax to last night,” said Julius thoughtfully.

“Yes, it does,” admitted Tuppence. “But, anyway, here goes. Perhaps you’d both come, too, in case she springs on me, or anything. You see, we don’t know what mood she’ll wake up in.”

Sir James and Julius accompanied her to the door.

“Where’s the key? Oh, of course, I’ve got it myself.”

She put it in the lock, and turned it, then paused.

“Supposing, after all, she’s escaped?” she murmured in a whisper.

“Plumb impossible,” replied Julius reassuringly.

But Sir James said nothing.

Tuppence drew a long breath and entered. She heaved a sigh of relief as she saw that Mrs. Vandemeyer was lying on the bed.

“Good morning,” she remarked cheerfully. “I’ve brought you some tea.”

Mrs. Vandemeyer did not reply. Tuppence put down the cup on the table by the bed and went across to draw up the blinds. When she turned, Mrs. Vandemeyer still lay without a movement. With a sudden fear clutching at her heart, Tuppence ran to the bed. The hand she lifted was cold as ice.... Mrs. Vandemeyer would never speak now....

Her cry brought the others. A very few minutes sufficed. Mrs. Vandemeyer was dead—must have been dead some hours. She had evidently died in her sleep.

“If that isn’t the cruellest luck,” cried Julius in despair.

The lawyer was calmer, but there was a curious gleam in his eyes.

“If it is luck,” he replied.

“You don’t think—but, say, that’s plumb impossible—no one could have got in.”

“No,” admitted the lawyer. “I don’t see how they could. And yet—she is on the point of betraying Mr. Brown, and—she dies. Is it only chance?”

“But how——”

“Yes, how! That is what we must find out.” He stood there silently, gently stroking his chin. “We must find out,” he said quietly, and Tuppence felt that if she was Mr. Brown she would not like the tone of those simple words.

Julius’s glance went to the window.

“The window’s open,” he remarked. “Do you think——”

Tuppence shook her head.

“The balcony only goes along as far as the boudoir. We were there.”

“He might have slipped out——” suggested Julius.

But Sir James interrupted him.

“Mr. Brown’s methods are not so crude. In the meantime we must send for a doctor, but before we do so, is there anything in this room that might be of value to us?”

Hastily, the three searched. A charred mass in the grate indicated that Mrs. Vandemeyer had been burning papers on the eve of her flight. Nothing of importance remained, though they searched the other rooms as well.

“There’s that,” said Tuppence suddenly, pointing to a small, old-fashioned safe let into the wall. “It’s for jewellery, I believe, but there might be something else in it.”

The key was in the lock, and Julius swung open the door, and searched inside. He was some time over the task.

“Well,” said Tuppence impatiently.