No doubt this was a letter for Mr.Sleuth; the lodger must have relations and acquaintances somewhere in the world.

All gentlefolk have.

But when she picked the small envelope off the hall floor, she saw it was a letter from Daisy, her husband's daughter.
"Bunting!" she called out sharply.

"Here's a letter for you." She opened the door of their sitting-room and looked in.

Yes, there was her husband, sitting back comfortably in his easy chair, reading a paper.