“But what were Lawrence Cavendish’s finger-marks doing on it? He never went near the poison cupboard the day we were there!”
“Oh, yes, he did!”
“Impossible! We were all together the whole time.”
Poirot shook his head.
“No, my friend, there was a moment when you were not all together. There was a moment when you could not have been all together, or it would not have been necessary to call to Monsieur Lawrence to come and join you on the balcony.”
“I’d forgotten that,” I admitted. “But it was only for a moment.”
“you have heard your wife’s dying words repeated here. Can you explain them in any way?”
“Certainly I can.”
“You can?”
“It seems to me very simple. The room was dimly lighted. Dr. Bauerstein is much of my height and build, and, like me, wears a beard. In the dim light, and suffering as she was, my poor wife mistook him for me.”