This time it actually seems like it was a real case concept for the main game that was squished into a 45 minute dlc, as evidenced by the loose implements that either come into play out of nowhere (sleeping pills, outer view from veranda, Halara talking to animals) or go nowhere (the servant, sleeping pills being added to the meal the servant made without anyone noticing).
Once again, there's a minimal amount of new assets made for it, only having a single room to investigate, and even the two named and voiced npcs use generic models.
Unfortunately the minuscule format of these dlcs means they're just not able to go into any significant detail on anything like the main game could, and ends up feeling like another half assed mystery only concerned with ending at the 45 minute mark.