In the end credit roll for Matthew Holness’s Possum, you see in the fine print that it was based on his short story of the same name, published in the anthology The New Uncanny: Tales of Unease. Weird that the source material would be buried in the credits and not shown during opening titles, as it is in most cases. I haven’t read the short story but I’m going to track it down now that I’ve seen the movie. I suspect it’s not going to be all that different from the movie, because even though it has a running time of an hour and a half, there’s perhaps only about half an hour of story.