Charles Williams only wrote one short story: “Et in Sempiternum Pereant.” It was published in The London Mercury in 1935. You can read the full text on Project Gutenberg Australia and listen to a really excellent audio version by voice actor Ulf Bjorklund.
The story features Lord Arglay, one of the main characters from Many Dimensions. It is a tight, streamlined piece–for CW, anyway–with what I read as a perfect unity between setting and theme. The descriptions are extremely vivid, and it is only at the end that CW lets his diffuse style get away from him. There are only two characters, and their stark contrast and surprising affinities are worthy of a superhero story. The theological twist at the end is a shocker. Do give it a read and/or listen and leave a comment below; I would love to know your thoughts about this fascinating, creepy tale.