I returned in a minute with the waiting taxi. The scarf had been unwound from the stranger’s face, and I gave a start of surprise.

“He’s not a Jap,” I ejaculated in a whisper to Poirot.

“Observation was always your strong point, Hastings! Nothing escapes you. No, the man is not a Jap. He is an Italian.”

We got into the taxi, and Poirot gave the driver an address in St. John’s Wood. I was by now completely fogged. I did not like to ask Poirot where we were going in front of our captive, and strove in vain to obtain some light upon the proceedings.