The Killer Inside Me by Jim Thompson:
It happened three days after my talk with Rothman. It was a payday Saturday, and I should have been working, but somehow I hadn’t been able to bring myself to do it. I’d stayed in the house all day with the shades drawn, pacing back and forth, wandering from room to room. And when night came I was still there. I was sitting in Dad’s office, with nothing on but the little desk light; and I heard these footsteps moving lightly across the porch, and the sound of the screen door opening.
It was way too early for Amy; but I wasn’t jittered any. I’d had people walk in before like this.