Every year for the past two or three years, I've downloaded or pulled out, depending on format, a few short story anthologies that were specifically released for Christmas.
The Valancourt anthology of Victorian Christmas Ghost Stories was just far too tempting for me not to buy, and the Christmas Stalkings compilation is also new to me. I've owned The Big Book of Christmas Mysteries and Crimson Snow for a couple of years, but still haven't finished all of the stories even once.
Christmas Most Foul is available through the KU library, and I've read three out of the four stories included. Two are Albert Campion shorts by Margery Allingham that are just okay, and then there are two full-length novels: Thou Shell of Death by Nicholas Blake, which I really liked when I read it last year, and There Came Both Mist And Snow by Michael Innes, which I've not yet read and which is the reason that I borrowed the book again this year.
I usually read ten or fifteen Christmas shorts throughout the season.