What is the author's style in The Day They Came to Arrest the Book by Nat Hentoff?

The novel uses a non-formal English and is easy for even younger individuals to comprehend. The language is suited to the character speaking, in that the young individuals of the story often use slang terms, contractions, and informal phrasing such as "aint" and "naw." Adults, on the other hand, often speak more formally, but still use a casual speaking style that is easy to understand.