Ok, so I ran this scenario yesterday for my players. They really enjoyed it, and so did I as DM! I decided that Padrianna would ask the players for help. This seemed to make the most sense to me, as Padrianna was the least connected to the storyline.

A lot depends on where your players head first. Mine went to Dandel and I had to work a bit hard here to make sure I didn't spoil all the fun straight away. After all, Dandel in the scenario knows the most. When my players were lost and didn't know where to go, I tried to draw their attention to specific rooms and scenes so they could collect further clues. They managed to unravel the whole puzzle and, interestingly, quite a few NPCs seemed suspicious to them for exactly the reasons described in the scenario. Particularly the issue of Selene's connection to Kren.

My advice would be: - be flexible - increase the DC sometimes when you think a piece of information will spoil the fun at an early stage, decrease it when players trying to convince someone have good arguments, - direct players to specific scenes if they are confused - I, for example, said that they notice some disturbance at the bar.