Poirot tried him with several questions. Sometimes the man did not answer at all; sometimes he repeated the same phrase. Poirot made a sign to me to ring up on the telephone.

“Get Dr. Ridgeway to come round.”

The doctor was in, luckily; and as his house was only just round the corner, few minutes elapsed before he came bustling in.

“What’s all this, eh?”

Poirot gave him a brief explanation, and the doctor started examining our strange visitor, who seemed quite unconscious of his presence or ours.

“H’m!” said Dr. Ridgeway, when he had finished. “Curious case.”

“Brain fever?” I suggested.