@melissah: I wish I could remember names or locations but, try as I might, I keep drawing blanks. This was one of those modules I happened to stumble across by sheer happenstance, and forgot to bookmark it.
@jmlzemaggo: I've actually been using the layout of the guild as part of my searching (ie: checking them all out in the toolset). I remember it pretty well, so here's a bit of a description of it.
For starters, it's located down in the basement of a building (house/inn/tavern...) and you start out in the area by walking down a short flight of stairs which leads to a small hallway. At the opening of the hallway there's a large room with plenty of rogues training on combat dummies. If I remember right, NPC rogues are practicing their hide/sneak attack skills.
To the left of the area with the combat dummies, the room continues on to a more common area with a merchant, some rogues milling around and 3 doors (2 of them on the far left wall and one on the right wall). The top-left door leads to a room full of chests where you can practice your lockpicking skills, and the bottomleft door leads to another practice room. I'm not 100% on this, but I believe that door takes you to a room filled with traps so you can practice disarming them. The door on the bottom-right wall leads you into a small room where the guild master and a couple of his lackeys are. That's pretty much all there is to the guild.
If it helps, I'm pretty sure I remember a quest that I'm fairly certain was from this module. It involves you saving a shop owner who is sympathetic to the "good guild" from being shaken down by thugs from the guild you're trying to overthrow. I also remember that you have to prove your worth to the guild master that you're trying to overthrow. He demands a test of your skill in the training rooms of the guild before he'll grand you admission (similar to the academy in the original NWN campaign, before you can meet Aribeth).
One other thing that came to me was the fact that your father was somehow involved in this. During the module, you start to uncover clues about the "evil guild" and their involvement in his murder. I can't remember if he was once the former leader of said guild and the present master had him killed to take over or not, but it's something along those lines.
I hope this helps a bit. I get the feeling that the name of the module is right at the tip of my tongue, but I simply can't remember it. Thanks again for all the help! I'm going to keep looking, if I have to go through every module listed on the Vault, one by one...
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