The doctor uttered an exclamation.

“Count Foscatini. He has a flat in Regent’s Court. I must go at once. What can have happened?”

“A patient of yours?” asked Poirot.

“I attended him for some slight ailment a few weeks ago. An Italian, but he speaks English perfectly. Well, I must wish you good night, Monsieur Poirot, unless——” He hesitated.

“I perceive the thought in your mind,” said Poirot, smiling. “I shall be delighted to accompany you. Hastings, run down and get hold of a taxi.”

Taxis always make themselves sought for when one is particularly pressed for time, but I captured one at last, and we were soon bowling along in the direction of Regent’s Park. Regent’s Court was a new block of flats, situated just off St. John’s Wood Road. They had only recently been built, and contained the latest service devices.

There was no one in the hall. The doctor pressed the lift-bell impatiently, and when the lift arrived questioned the uniformed attendant sharply.

“Flat ii. Count Foscatini. There’s been an accident there, I understand.”

The man stared at him.

“First I’ve heard of it. Mr. Graves—that’s Count Foscatini’s man—went out about half an hour ago, and he said nothing.”