I just downloaded this story, and although I planned to read it later, I couldn't put it down.
"You Are Just a Guest" documents the first (and, perhaps, last?) few days of a couple's life in their new home. It's written as a series of blog/twitter posts. I was uncertain, at first, about the format. I have never been a big fan of the serial letters style of story-writing, and I was afraid some of the atmosphere would be lost in the style. I needn't have worried. Mr. Kelly did an excellent job of capturing the tension and expressing it through the main characters' reports.
Near the end, it seemed as though it slipped, briefly, out of the social media format into real life, and that distracted a little. Not much, but I did think, "Wait, is she still writing this? But she's walking...is she carrying the computer? Using a phone?" I think it was necessary to get the story across, and it certainly didn't detract from the overall experience.
All in all, I am glad I read this at work, in my sparse, brightly-lit office, rather than at home, on the couch, in the dark. I would recommend this story to others, and plan to!