Who is the narrator, can she or he read minds, and, more importantly, can we trust her or him?
Third Person (Omniscient)
In Sabriel, we have the advantage of a third person omniscient narrator, allowing us to hop in and out of different characters' heads as needed. Usually we are treated to Sabriel's point of view, since she's our main character and all, but on several different occasions we get glimpses of what some of the other characters are thinking too.
In the prologue, for example, we get to experience Sabriel's father's point of view while he rescues baby Sabriel. Then later on, we step inside the eyes of Touchstone as he's awakened from his two-hundred-year nap, which really doesn't seem pleasant:
"[…] fierce red light, pain exploding everywhere, rocketing from toes to brain and back again." (14.2)
We're right there with him, blinded by the light and tuned right in to his misery. And while there isn't any clear pattern to these leaps in viewpoint—for instance, we even get to briefly experience life as Thralk, the undead creature who attacks Sabriel when she first arrives in the Old Kingdom—the switch always provides some essential context to a scene. It also keeps us interested as readers, because we never know when we're going to get the chance to consider the story from a different perspective.