What is the author's style in The Girl Who Circumnavigated Fairyland in a Ship of Her Own Making by Catherynne M. Valente?

The story is told from the third-person and past tense point of view and generally from a limited perspective of September, the book's heroine and protagonist. In this form of storytelling, the narrative describes events as September sees them, feels them, and experiences them. It comments on her feelings, on her interpretations, on her actions and on her reactions almost exclusively.

There are a few exceptions. The interludes are also third-person narration, but are told from the point of view of the Key - specifically, what happens to it and how it interacts with the places and people in Fairyland with whom September has previously had contact. These interjections serve to remind the reader of activity in what might best be described as a secondary, or sub-plot. Another exception is how, in the main body of the story, narration occasionally offers a glimpse or two into the motivations and reactions of other characters - there is frequent commentary on, for example, the Green Jacket's reactions to the circumstances in which it finds itself. A third exception is how the narrator interjects commentary from her own first person perspective. These interjections remind the reader of being told a story like a child who is being read to.

All these exceptions, these occasional diversions from the primary point of view, serve to heighten and increase the reader's interest, creating a sense of intrigue and wondering not only what's going to happen next, but in what interesting way what's happening is going to be described.