Inexcusable is written from the first-person singular perspective. Keir tells his story as he sees it. The author ensures that readers get all of the information they need, but it is only through Keir's eyes that the story is conveyed.
It is rare that a tale of rape is told from the perspective of the rapist. The resulting effect is that some people may read this and connect to what Keir is saying, and they will see their actions in a new light. Keir thinks of himself as the victim for a great portion of this book, and it is only at the end that he acknowledges he is in fact the perpetrator.
Inexcusable