"My mind is starting to go round like a pinwheel, thinking of all those windows and doors," she murmured to herself.

She sat down once more, and taking a pencil and a piece of paper drew a plan of the lower floor of the house.
And now I've studied it, she thought after a while, I'm no further than if I hadn't.

As far as I can figure out, there are so many ways for a clever man to get into this house that I'd have to be a couple of Siamese twins to watch it properly.

The next house I rent in the country, she decided, just isn't going to have any windows and doors--or I'll know the reason why.
But of course she was not entirely shut off from the world, even if the worst developed.

She considered the telephone instruments on a table near the wall, one the general phone, the other connecting a house line which also connected with the garage and the greenhouses.