I enjoyed the atmosphere, the idea and the writing but was really disappointed by the last paragraph, it seemed a bit of a cop-out. As it is it sounds like the pitch for a novel not a short story. A shame when there are so many ways to round off a story like this; a secret shared with Grandfather, it not working again, the photo not being there next time to name a few. Good luck if you do expand it as it has a lot of potential.
oryx25