Maybe it's that flash of movement you are sure you saw from the corner of your eye just a second ago, but when you turned, nothing was there. Maybe it's the new noise in your house that you tell yourself is just the joists settling. Maybe it's your neighbor who seems friendly and convivial, but there is something just a bit off about them.
Ordinary people encountering other people--or, perhaps, things--are at the crux of what I write. Ordinary people can be heroes, but they can also have the fecal matter scared out of them when they are stepping up.
Some tales have a happy ending, but not all. And whether the monsters are human, or something else, their stories will be real.