Who is the narrator, can she or he read minds, and, more importantly, can we trust her or him?
First Person (Central)
The story is told not from Sarah's perspective, but from Anna's. By telling the story from Anna's perspective, the suspense is heightened because readers only know what Anna knows—and because of this, we experience the same anxiety she does about whether or not Sarah will stay. Additionally, by telling the story from Anna's first-person perspective, readers get to know Sarah gradually through Anna's observations and encounters, making it easy to understand what the Witting family is feeling and thinking, and sharing in the experience of getting to know Sarah.