Very solid one-shot mission with options to add more details depending on the playstyle of your gaming crew. The scenario includes noteworthy characters and a cool creature, as well as descriptive language that helps set the scene for key encounters (e.g., meeting the informant, discovering the blood trail in the Shadowside). The Radio Wraith should make for a unique and challenging boss fight. Plus, there are options presented at the end for extending this adventure into something longer (e.g., finding a cure for an otherworldly infection that’s slowly turning you into gold).
A few minor points: I think there may be a typo with one NPC referred to by two names (Goat & Crow). And I recommend tweaking the wording of the Opera House encounter to be clear that the soap smells foreign made, rather than potentially implying the locals don’t wash. Alternatively, this could be changed to highlight the smell of their equipment (e.g., gunpowder and grease that doesn’t fit with the Opera House aesthetic).