This is by far one of the most stylish and interesting adventures that I've GMed to date. It gives a very interesting twist on rural Eberron and is heavily steeped in the lore of the world, while also keeping stakes focused, small, and interesting.
The NPCs are highly memorable and the villains terrifying; it's a masterclass in character design that my players loved. Your players will definitely be thinking and talking about the characters in this story for weeks to come, and to me that's about the best thing a oneshot can do.
There's something for everyone here, too; while the bulk of the adventure is a murder-mystery, there are combats and treasure aplenty, so there will definitely be great appeal for everyone at your table.
Overall, I strongly recommend purchasing this mini-campaign and running it; it's a very different view into a part of Eberron that's infrequently explored, and one that really deepens the scope of the setting.