"Simpson," said Grant, "what were you yesterday when you were gathering information about the Ratcliffes?"

"I was an ex-serviceman with writing-pads, sir."

"Oh, well, you can be an ex-serviceman again today. Very self-respecting, clean, with a collar, not a muffler, and out of a job. I want to know about a Mrs. Everett who lives at 98 Brightling Crescent, off the Fulham Road. I don't want any door-to-door business. She's shy of that, and you must be very careful. She looks as if she attends church. Try that. I think you should find it useful. Bar a club, it's the gossipiest community I know of. I want to know, above all, where her friends and relations live. Never mind her correspondence. I can keep an eye on that myself, and, in any case, I have an idea that that isn't likely to be useful. Mrs. Everett was not born yesterday. Get that into your head and remember it. Don't work faster than you can with safety. If she spots you, it will mean that some one else will have to take over, and a promising line of investigation will be spoiled. The minute you get something, let me know, but don't come back here until you've talked to me on the telephone first."

That was how Mr. Caldicott, the clergyman of the Brightlingside Congregational Church, pushing damply at the mower which jibbed at the tough grass of his front lawn and finding the March sun too prodigal of its blessing, became aware that his labours were being viewed by a stranger with a queer mixture of sympathy and envy. Seeing that he had been discovered, the stranger made a sketchy motion towards his cap, in deference evidently to the cloth, and said, "That's hot work on a day like this, sir. Will you let me take a hand?"