Close beside him a batten, slung on ropes, ran across from his gallery to the opposite one. Across the batten hung a pulley and over the pulley was a rope. Looking down the far length of the rope, he saw it run away in sharp perspective from dark into light. He had a bird’s-eye view of the lamp-lit set, the tops of the wings, the flat white strip of table; and there, at the end of the rope in the middle of the table, a flattened object, rather like a beetle with a white head and paws. That was Alfred Meyer. The other end of the rope, terminating in an iron hook, was against the pulley. The hook had been secured to a ring in the end of the rope, and the red cord which Carolyn had cut was also tied to the ring. The cut end of the cord dangled in mid-air. On the hook he should have found the counterweight.

But there was no counterweight.

He looked again at the pulley. It was as he had thought. A loop of thin cord had been passed round the near end of the batten and tied to the gallery. It had served to pull the batten eighteen inches to one side. So that when the bottle dropped it was slightly to the right of the centre of the table.

“Slap me and sink me!” said Alleyn and returned to the stage. He found Ted Gascoigne by the stage-door. With him were two large dark men, wearing overcoats, scarves, and black felt hats; a police officer, a short pink-faced person who was obviously the divisional surgeon. “Do they call them divisional surgeons in this country?” wondered Alleyn.

They were some time at the stage-door. Gascoigne talked very fast and most confusedly. At last he took them on to the stage, where they were joined by Te Pokiha. From the wings Alleyn watched them make their examination. It gave him a curious feeling to look on while other men did his own job. They examined the end of the rope which was still knotted into the net enclosing the bottle, and the piece of red-bound wire cord that lay on the table. Gascoigne explained the mechanism of the descending jeroboam. They peered up into the grid. Gascoigne pointed out the other end of the red cord.

“When Miss Dacres cut it, it shot up,” he explained.

“Yes,” said the detective. “Ye-ees. That’s right. Yeees.”

“Out comes the old notebook,” said Alleyn to himself.

“Hullo,” said a voice at his elbow. It was Hambledon.

“Carolyn wants to see you,” he whispered. “What’s happening out there?”

“Police doing their stuff. Wants to see me, does she?”

“Yes. Come on.”