This is an example of a book that
needs the different POV of four different characters.
One of the advantages of first-person narrative is that the narrators don't have to tell the truth. Rather like real life. But with the predominance of third-person narrative, we have become accustomed to the omniscient view of the impersonal narrator.
And then you have another type where the narrator is a character in the story, but a relatively minor one, so that the narration switches between first-person and third-person. Think of
Sherlock Holmes or
The Great Gatsby.