He drew a sharp breath. “There’s nothing in the world I want less!”

She laughed. “And you won’t be sulky if we don’t go out tomorrow morning — or if we lunch in bed?”

“Marie Lou! you angel!” He leant over her. Her soft arms were round his neck; she whispered in his ear: “Richard, my darling, this is the perfect ending to the Fairy Story of the Princess Marie Lou.”

V

The Duke de Richleau put down his interesting book on murder and picked up the shrilling telephone at his side.

“Thank you,” he said, “I am much obliged.” He replaced the receiver and took up his book again, reading quietly till the end of the chapter. He carefully inserted a marker, and laid the book beside the bed. Then he examined the automatic which the waiter had brought him in the restaurant, also a small bottle, taken from among those on his washstand. He put the bottle and the weapon in his pocket, and lighting a fresh cigar, he left the room. As he came out into the corridor he glanced swiftly to right and left; it was in semi-darkness and no sound disturbed the silence. Outside the door to the left of his room a neat pair of black shoes reposed — Simon’s. Opposite lay a pair of large brogues, Rex’s. Outside Marie Lou’s door were a tiny pair of buckled court shoes, and beside them — “Strange,” thought the observant Duke — a pair of man’s patent evening shoes.

“Very strange,” the Duke thought again; then a gurgle of delighted laughter came faintly from beyond the door. De Richleau raised one slanting eyebrow meditatively. Sly dog, that Richard; what a thing it was to be young and in Vienna, city of dreams. How fond he was of them all, and how fortunate he was — that, at his age, all these young people seemed to take such pleasure in his company. Life was a pleasant thing indeed. He drew thoughtfully on his cigar, and quietly strolled down the corridor.

His walk had all the assurance that marked his every movement with distinction; nevertheless, his footsteps were almost noiseless. He came to a baize door, and passed through it to the service staircase beyond. He mounted slowly in the darkness, his bright eyes gleaming like those of some great cat. From a long acquaintance with continental hotels he knew that spare pass-keys were always to be found in the floor-waiter’s pantry. Two floors above his own he found the room he sought, with its nails and brushes. The light was on, a tired chamber-maid was sleeping in a chair, a paper-covered novel on her knees. With infinite precaution De Richleau took the key he needed from its hook above her head. He was easier in his mind now — the possession of that key was the one thing that troubled him. Soft-footed he walked down the passage, seeking Leshkin’s room. He found it and inserted the key in the lock. He turned it gently and the door opened without a sound. He slipped inside.

Kommissar Leshkin was late in going to bed. He stood in his stockinged feet and shirt-sleeves, removing his tie and collar. He had some little difficulty, as his fat fingers still bore the angry weals where Valeria Petrovra’s whip had caught them. He took a pot of ointment from the dressing-table and was just about to apply it to the cuts on his face; in the looking-glass he caught the reflection of a white shirt-front. He dropped the pot and spun round.

It was the Duke, grey-haired, immaculate in evening dress. In his right hand he held an automatic, in his left a long, evenly burning cigar. For a moment the Kommissar did not recognize him; he looked so different from the ragged prisoner of the Pecher-Lavra Prison.