The Sergeant looked up and nodded. “Yes. I think so, Mr. Carey. But first I would like to ask you some questions.”

“I’ll do my best to …” he began.

But he never learned what the Sergeant’s questions were. At that moment the door was flung open and Arthur came back into the room.

He slammed the door behind him, walked over to the table, and looked grimly at George and Miss Kolin. His face was pinched and grey with anger. Suddenly he threw two small, bright yellow tubes down on the table in front of them.

“All right,” he said. “Which of you is it? Or is it both of you?”

The tubes were about an inch and a half long and half an inch thick. They looked as if they had been cut from bamboo and then coloured. The three round the table stared at them, then up at Arthur again.

“What is this?” snapped the Sergeant.

Arthur burst into an angry torrent of Greek. George glanced at Miss Kolin. Her face was still impassive, but she had gone very pale. Then Arthur stopped speaking and there was silence.

The Sergeant picked up one of the tubes, then looked from it to George and Miss Kolin. The muscles of his face set. He nodded to Arthur.

“Explain to Mr. Carey.”