Balder obeyed. Slipping a pair of handcuffs from his pocket, Elk snapped them on to the wrists. Deftly the detective strapped the arms from behind, drawing them tight, so that the manacled hands had no play.

“This is very uncomfortable,” said Balder. “Is it usual for you to make mistakes of this character, Mr. Elk? My name is Collett-Banson.”

“Your name is Mud,” said Elk, “but I’m willing to listen to anything you like to say. I’d rather have your views on cyanide of potassium than anything. You can sit down.”

Dick saw a gleam come to the man’s eye; it flashed for a second and was gone. Evidently Elk saw it too.

“Don’t let your hopes rest upon any monkey tricks that might be played by your attendants,” he said, “because fifty C.I.D. men, most of whom are known personally to you, are disposed round this house.”

Balder laughed.

“If they were round the house and on top of the house, they wouldn’t worry me,” he said. “I tell you, inspector, you’ve made a very grave error, and one which will cost you dear. If a gentleman cannot sit in his own drawing-room”—he glanced at the table—“listening to a wireless concert at The Hague without interfering policemen—then it is about time the police force was disbanded.”

He walked across to the fireplace carelessly and stood with his back to it; then, lifting his foot, he kicked back one of the steel fire-dogs which stood on either side of the wide hearth, and the “dog” fell over on its side. It was a nervous act of a man who was greatly worried and was not quite conscious of what he was doing. Even Elk, who was all suspicion, saw nothing to excite his apprehension.

“You think my name is Balder, do you?” the man went on. “Well, all I can say is——”

Suddenly he flung himself sideways on to the hearthrug, but Elk was quicker. As an oblong slip of the floor gave way beneath the man’s weight, Elk gripped him by the collar and together they dragged him back to the room.