This is an Exceptional Story, a bonus piece of content for subscribers which can also be purchased by itself at a premium.
This story centers on spiders. There are a variety of spiders in Fallen London, from the sorrow-spiders that hatch in eyeballs to their larger cousins like spider councils or senates, huge beings formed from conglomerates of smaller ones.
This features the spiders of Vesture, a kingdom on the Elder Continent. Fallen London takes place in a giant cavern called the Neath, which has a variety of locales (such as Hell). The Elder Continent often seems to intentionally evoke North Africa as well as Eden, and is connected with immortality and life.
Vesture is a kingdom made of an alliance between spiders and humans. This story examines that connection, entangling you in a royal family's dispute about how to handle the death of a great, vast spider and the fallout that will bring. Family loyalty and tradition vs progress are the main themes.
I enjoyed the story, but felt a little constrained. There are some very meaningful choices (including a permanent companion and very different endings), but I didn't feel like I really shaped the story, mostly witnessing someone else's story and stepping in at the last moment. I prefer the exceptional stories where you take a more prominent role, even if it's all still scripted.