The Hallow Man — Rebecca M. Senese

As a child, Monica's grandmother warned her of the Hallow Man. Every Halloween he demands a sacrifice, sometimes big, sometimes small. One night he comes for Monica and she begs him to pass her by. He does, but extracting a terrible price.

Now the Hallow Man is coming again and this time Monica can't imagine what she'll have to pay.

And pay.

"The Hallow Man" is a short story.