So its that tricky time for the Crooked House plot in the free city. I was able to get a player to agree to play a doppelganger and they are a good role player so I have no worries there. I've asked for bulk sense motive and perception rolls from my party ahead of time to try and keep the role playing seemless. My question for you is the best way to catch the party. I was thinking a paralytic or sleep poison in their food, the issue is there are 2 characters immune to paralysis and sleep. I was thinking to have everyone else carted away and the city guards and the arrest plot only be used on the remaining 2 characters. Of course the guards will bring them out of their rooms one by one for safety reasons and will not let them see their friends. I also could just have a gang overwhelm them in their rooms. The problem is one of the PCs immune is a priest and I imagine the gang would cuff and gag him as soon as possible.
I'm really open to other ideas within the dopps means to easily get the two characters who are immune to sleep and poison.