what is the mood of the short story book the babysitter by jane yolen?

The tone and mood of the story is not constant. It keeps changing after every paragraph in which a possibility of an incident is presented. For example, the tone of horror when the baby swallows the diaper pin is suddenly interrupted by the embarrassment of Mr. Tucker walking in on the babysitter who is bathing in the tub. There is no singular effect of the tone or mood that the reader feels. The story that begins in an unsuspectingly normal way turns out to be that of horror and raw sexual desire. With the advancement of the story, the moods keep getting darker and the tone becomes faster.