She knew that he himself would suggest some place for the key to lie in.
"Put it under the edge of the carpet in the corner near the door," he suggested.

"You can easily turn the carpet up a little between the rings." "That is a good idea," she said.

"It is as well that you should know where it is, in case anything were to happen to me." She was already in the corner, and she thrust the key under the doubled edge of the crimson carpet.
"You are ingenious," she observed drily, as she rose to her feet.

"I should not have thought of that.

It is a pity that you have not been able to apply your ingenuity better in other ways, too.