The Housemaid's Wedding by Freida McFadden

The Housemaid’s Wedding is a winter-themed short story meant to fill in the long gap between Book 2 of the Housemaid series (The Housemaid’s Secret) and Book 3 (The Housemaid is Watching). It can be read either between Book 2 and Book 3, or after Book 3.

Today is supposed to be the happiest day of my life.

I'm engaged to the man of my dreams, and in a few short hours, I'm going to stand before a judge, who will declare us husband and wife, till death does us part. Despite some bumps in the road, this day is everything I dreamed it would be.

There's only one problem:

Someone out there doesn't want me to live long enough to say my vows.

And if I'm not careful, they may very well get their wish.