The Tell-Tale Heart

This one is a confession, more or less, from someone very keen to convince you they are perfectly sane while calmly explaining exactly why an old man with a strange pale eye had to go. That insistence on being reasonable is the whole trick of it, and it only gets more unsettling the longer the voice talks.

Poe wrote it short and tight, with no wandering about the house or the weather. It is one voice, one plan, carried out with a horrible amount of care, right down to how the evidence gets tucked away out of sight, and then undone by the narrator's own nerves.

The fear here isn't jump scares or things creaking in the dark. It's the slow squeeze of a voice trying so hard to sound calm and reasonable that it starts to unravel on its own, until the sound in the narrator's own head becomes impossible to bear.

It's short enough to read in one sitting, which suits it perfectly. Read it with the lights on, and maybe don't listen too hard for anything underfoot once you're done.