I played this scenario recently and did not care for it one bit. After reading through it I think I now understand why our play of it went south... if the GM chooses to portray an NPC a certain way, the players are likely to choose a route that will not ultimately serve them. So, if you have an adversarial GM who likes to antagonize the players via "innocent" roleplay, the players are doomed to failure. The entire plot hinges on the interaction with one NPC and if that isn't handled carefully and skillfully by the GM, it becomes farcical.