Read it through once

As she did so her eyes glanced casually over the ceiling till they were arrested by a spot in the middle of its white surface which she had never noticed there before. It was about the size of a wafer when she first observed it, but it speedily grew as large as the palm of her hand, and then she could perceive that it was red. The oblong white ceiling, with this scarlet blot in the midst, had the appearance of a gigantic ace of hearts.