Poirot's eyes were shining with the green light I knew so well.
"How was it called, this book?" he asked.
"The Hidden Hand in China, I think it was called."
"Aha!" said Poirot, with almost a gasp. Then he said quickly, "Let me see the Chinaman, Ah Ling."
The Chinaman was sent for and appeared, shuffling along, with his eyes cast down, and his pigtail swinging. His impassive face showed no trace of any kind of emotion.
"Ah Ling," said Poirot, "are you sorry your master is dead?"
"I welly sorry. He good master."
"You know who kill him?"
"I not know. I tell pleeceman if I know."
The questions and answers went on. With the same impassive face, Ah Ling described how he had made the curry. The cook had had nothing to do with it, he declared, no hand had touched it but his own. I wondered if he saw where his admission was leading him. He stuck to it too, that the window to the garden was bolted that evening. If it was open in the morning, his master must have opened it himself. At last Poirot dismissed him.