Prose fiction is usually referred to as being the direct form of speech, without the use of rhyme, or poetical techniques/riddles. So you can basically call prose fiction as being your everyday speech.
A definite meaning of Prose fiction is a:
"meaningful and grammatical written or spoken language that does not utilize the metrical structure, word transposition, or rhyme characteristic of poetry or verse; it is, however, raised above the level of lifeless composition or commonplace conversation by the use of balance, rhythm, repetition, and antithesis. In literature, prose is the usual mode of expression in such forms as the novel, short story, essay, letter (epistle), history, biography, sermon, and oration."
As for Wuthering Heights, I'm really sorry for I'm not really doing that text.