“Let’s have your key to the apartment.—Have you been inside?”

“No, sir. Orders were to stay out here.”

We passed into the dead girl’s living-room. The shades were still up, and the sunlight of midday was pouring in. Nothing apparently had been touched: not even the overturned chairs had been righted. Markham went to the window and stood, his hands behind him, surveying the scene despondently. He was laboring under a growing uncertainty, and he watched Vance with a cynical amusement which was far from spontaneous.

Vance, after lighting a cigarette, proceeded to inspect the two rooms, letting his eyes rest searchingly on the various disordered objects. Presently he went into the bathroom and remained several minutes. When he came out he carried a towel with several dark smudges on it.

“This is what Skeel used to erase his finger-prints,” he said, tossing the towel on the bed.

“Marvellous!” Markham rallied him. “That, of course, convicts Spotswoode.”

“Tut, tut! But it helps substantiate my theory of the crime.” He walked to the dressing-table and sniffed at a tiny silver atomizer. “The lady used Coty’s Chypre,” he murmured. “Why will they all do it?”

“And just what does that help substantiate?”

“Markham dear, I’m absorbing atmosphere. I’m attuning my soul to the apartment’s vibrations. Do let me attune in peace. I may have a visitation at any moment—a revelation from Sinai, as it were.”

He continued his round of investigation, and at last passed out into the main hall, where he stood, one foot holding open the door, looking about him with curious intentness. When he returned to the living-room, he sat down on the edge of the rosewood table, and surrendered himself to gloomy contemplation. After several minutes he gave Markham a sardonic grin.