No matter the subgenre, all horror shares an overarching theme: fear. Whether it’s splatterpunk, serial killer, supernatural, or anything else, every book in this genre is a spine-tingler. You can never go wrong in ramping up the fear factor, and the good guys don’t always have to win. And where there’s not fear, there’s tension. Every horror reader wants tension. They want to be concerned for the safety — and often sanity — of the characters. You need to make those characters relatable and then put them on a path to destruction. Like every thriller has a ticking clock, every…