Probably the most readable story I've seen from Stross so far - at least the jargon doesn't come in the way, is much less than his normal, & appears late in the story.
There is a separate underlying nonsense plot of Santa Claus' visit to office on Christmas eve. Only this Santa Claus is evil! And hero must throw him out before any damage is done.
I've a feeling its appeal is likely to be uneven across locales.
Fact sheet.First published: tor.com, 23 December 2009.
Download full text from publisher's site.
Nominated for Hugo Award 2010 in novelette category.
Related: Stories of Charles Stross.