What is the author's style in The House of God by Samuel Shem?

Janet Evanovich has utilized the best and the worst in New Jersey vernacular in creating Stephanie Plum. The informal language creates a relaxed atmosphere while letting the humor show through. Complementing the dialogue is a narrative language that is slightly more formal and structured but manages to flow seamlessly with the common language. There are different styles of speech from the old school to street slang.