Who is the narrator, can she or he read minds, and, more importantly, can we trust her or him?
First Person (Central) and Second Person
The narration in this book is a little unusual in that it busts out the second person narration style, directly addressing Emmy, while also heavily featuring first person narration, too, since the book is basically one long letter from Matthew to his youngest sister. Every time you see the word you, know it's Matthew speaking directly to Emmy. Every time you see an I, though, well, he's referring to himself. As for the central bit, Matthew's the heart of this entire book, hanging out at the center of the chaos as it swirls around him.