Summary: Every Christmas, they each have their own lies to tell.
Review: Set at the holidays, but thoughtful rather than festive, That Untravelled World is post-Skyfall head canon for me now. It sets the right, almost melancholy tone; it's well written and suits the characters, and it manages to make a couple of things that didn't ring true in the film fall into place. I don't want to give anything away, so I'll continue under the spoiler cut, but if you enjoyed the film at all, this is a great, short continuation and a good read.
[SPOILERS FOR THE STORY! So read the story before this, or just skip this bit entirely. -- Why I thought 'That Untravelled World' improves on the film.] So the spoilers... It didn't make sense to me that Bond would take M to Skyfall with little idea of how he'd protect her there. He didn't know there would be weapons or that Kincade would be there to help. I especially didn't like the fact that M let Kincade keep that flashlight on, when it was an obvious signal of where they were. In light of the story, that scene becomes a setup to fake M's death, instead of uncharacteristic mistakes leading to her death. So, thank you, lonelywalker, for writing what was, for me, a more believable ending.