In "Fenimore Cooper's Literary Offenses," Mark Twain* identifies 18 of the 19 "rules governing literary art" that he mentions in his essay (keeping the remaining one to himself, it seems). Since horror fiction is literature, it's safe to say that these rules apply to this genre of writing as well as to any other, so aspiring writers of horror fiction would be well advised to learn from one of the literary giants of American--and, indeed, world--literature. These are the rules Twain identifies:
- That a tale shall accomplish something and arrive somewhere.
- They require that the episodes in a tale shall be necessary parts of the tale, and shall help to develop it.
- They require that the personages in a tale shall be alive, except in the case of corpses, and that always the reader shall be able to tell the corpses from the others.
- They require that the personages in a tale, both dead and alive, shall exhibit a sufficient excuse for being there.
- The require that when the personages of a tale deal in conversation, the talk shall sound like human talk, and be talk such as human beings would be likely to talk in the given circumstances, and have a discoverable meaning, also a discoverable purpose, and a show of relevancy, and remain in the neighborhood of the subject at hand, and be interesting to the reader, and help out the tale, and stop when the people cannot think of anything more to say.
- They require that when the author describes the character of a personage in the tale, the conduct and conversation of that personage shall justify said description.
- They require that when a personage talks like an illustrated, gilt-edged, tree-calf, hand-tooled, seven- dollar Friendship's Offering in the beginning of a paragraph, he shall not talk like a negro minstrel in the end of it.
- They require that crass stupidities shall not be played upon the reader as "the craft of the woodsman, the delicate art of the forest," by either the author or the people in the tale.
- They require that the personages of a tale shall confine themselves to possibilities and let miracles alone; or, if they venture a miracle, the author must so plausibly set it forth as to make it look possible and reasonable.
- They require that the author shall make the reader feel a deep interest in the personages of his tale and in their fate; and that he shall make the reader love the good people in the tale and hate the bad ones.
- They require that the characters in a tale shall be so clearly defined that the reader can tell beforehand what each will do in a given emergency.
- Say what he is proposing to say, not merely come near it.
- Use the right word, not its second cousin.
- Eschew surplusage.
- Not omit necessary details.
- Avoid slovenliness of form.
- Use good grammar.
- Employ a simple and straightforward style.
*Interestingly, Twain said that, as a boy, he'd read and enjoyed the work of Edgar Allan Poe but that, as an adult, he would read Poe "only for money."