‘An admirable maxim,’ said Sir Henry gravely.

‘When I had finished the Inspector said:

‘ “Thank you, Madam. Now I’m afraid I must ask you just to look at the body once more. Is that exactly the position in which it was lying when you entered the room? It hasn’t been moved in any way?”

‘I explained that I had prevented Mr Sanders from doing so, and the Inspector nodded approval.

‘ “The gentleman seems terribly upset,” he remarked.

‘ “He seems so—yes,” I replied.

‘I don’t think I put any special emphasis on the “seems”, but the Inspector looked at me rather keenly.

‘ “So we can take it that the body is exactly as it was when found?” he said.

‘ “Except for the hat, yes,” I replied.

‘The Inspector looked up sharply.

‘ “What do you mean—the hat?”

‘I explained that the hat had been on poor Gladys’s head, whereas now it was lying beside her. I thought, of course, that the police had done this. The Inspector, however, denied it emphatically. Nothing had, as yet, been moved or touched. He stood looking down at that poor prone figure with a puzzled frown. Gladys was dressed in her outdoor clothes—a big dark-red tweed coat with a grey fur collar. The hat, a cheap affair of red felt, lay just by her head.

‘The Inspector stood for some minutes in silence, frowning to himself. Then an idea struck him.

‘ “Can you, by any chance, remember, Madam, whether there were earrings in the ears, or whether the deceased habitually wore earrings?”

‘Now fortunately I am in the habit of observing closely. I remembered that there had been a glint of pearls just below the hat brim, though I had paid no particular notice to it at the time. I was able to answer his first question in the affirmative.

‘ “Then that settles it. The lady’s jewel case was rifled—not that she had anything much of value, I understand—and the rings were taken from her fingers. The murderer must have forgotten the earrings, and come back for them after the murder was discovered. A cool customer! Or perhaps—” He stared round the room and said slowly, “He may have been concealed here in this room—all the time.”

‘But I negatived that idea. I myself, I explained, had looked under the bed. And the manager had opened the doors of the wardrobe. There was nowhere else where a man could hide. It is true the hat cupboard was locked in the middle of the wardrobe, but as that was only a shallow affair with shelves, no one could have been concealed there.

‘The Inspector nodded his head slowly whilst I explained all this.

‘ “I’ll take your word for it, Madam,” he said. “In that case, as I said before, he must have come back. A very cool customer.”

‘ “But the manager locked the door and took the key!”

‘ “That’s nothing. The balcony and the fire escape—that’s the way the thief came. Why, as likely as not, you actually disturbed him at work. He slips out of the window, and when you’ve all gone, back he comes and goes on with his business.”