At half-past five that afternoon a small, under-sized man, who wore the uniform of the Metropolitan Water Board, rang at the basement entrance of the house in Pont Street, and the cook opened the door. "Well, missus?" he exclaimed merrily. "What's the trouble with the water here—eh?"

"Trouble? There's no trouble," replied the cook, who never suspected that four other men were in close vicinity awaiting their leader's call.

"Oh! but we've had a report that you've got a bad leak in one of your pipes. So I'll just have to look at it," and he carried in what looked like a walking-stick in wood with a wide trumpet end.

The cook took him into the scullery, and he placed the end of his stick upon the pipe. He listened intently, using it like a huge stethoscope. Then he went from pipe to pipe, chatting merrily with the cook and the man-servant all the time.

"Are your people at home?" he asked the cook.

"No. They went away an hour ago in a car down to Brighton for three weeks. So we're all off for a bit of a holiday, so hurry up! Do you find anything wrong, mister?"

"No," replied the shrewd little man. "There must be some mistake, I suppose. There's no leak here, as far as I can detect. But what a time you will have—eh? Did they take much luggage?"

"No, not very much. Madam said she would come up and get some more on Tuesday."

"Went sudden-like—eh?"

"Yes. All of a hurry. Their friend, Mrs. Pollen, slept here last night—which is a bit unusual. But my mistress had a 'phone message. Then they rang up for a car and all three went off. They left their address—the Metropole."