I found precious little to be interesting about this adventure. I read the whole thing, loved the other Class Challenge books, but this one just does so many things wrong to love. Here's a walk-through and review I did: https://rumble.com/v4aafpf-thiefs-challenge-from-ad-and-d-2nd-edition-rpg-review.html

Pros:
Great sandbox, very little railroading As advertised, well tailored to a single PC playing a thief (emphasizes skulking, larceny, and investigation) Great NPCs with motivations that match the tone of the story

Cons: The "bad guy"'s plan seems a little weak, and it would not at all be guaranteed to lead to "bad guy"'s desired outcome. The location of the town and the town's purpose (maintaining a river lock) where most of the adventure takes places does not make much sense from a practical real-world perspective. This really is not a problem, but might lead to the player dropping out of character to question the verisimilitude.

Overall, I recommend this adventure. Run as-is, it is very good. With a few tweaks, it can be great.

A good module for a sneaky, burglar type character. Lots of intrigue and investigation rather than combat. Nice NPCs. Cannot work out what campaign setting these HHQs are supposed to be in, if any. Easily adaptable though.

This and the others in the HHQ series can be a great one on one introduction to RPG's. I am actually going to introduce my fiance to the hobby with it. :) She told me she wants to play a plumber for her first character. It's going to be a BLAST! :)